docs: fix various sphinx warnings

[tshauck]

Which issue does this PR close?

Part of #370

Rationale for this change

In working towards #422 I noticed a few warnings when building the docs. This PR fixes those warnings and makes a few other tweaks (e.g. Intellij -> IntelliJ)

What changes are included in this PR?

Only doc changes.

How are these changes tested?

./build.sh            
Running Sphinx v7.1.2
making output directory... done
[autosummary] generating autosummary for: contributor-guide/contributing.md, contributor-guide/debugging.md, contributor-guide/development.md, contributor-guide/plugin_overview.md, index.rst, user-guide/compatibility.md, user-guide/configs.md, user-guide/datatypes.md, user-guide/expressions.md, user-guide/installation.md, user-guide/operators.md, user-guide/overview.md
myst v2.0.0: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'colon_fence', 'deflist', 'tasklist'}, disable_syntax=[], all_links_external=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=3, heading_slug_func=None, html_meta={}, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=True, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True)
building [mo]: targets for 0 po files that are out of date
writing output... 
building [html]: targets for 12 source files that are out of date
updating environment: [new config] 12 added, 0 changed, 0 removed
reading sources... [100%] user-guide/overview
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
copying assets... copying static files... done
copying extra files... done
done
writing output... [100%] user-guide/overview
generating indices... genindex done
highlighting module code... 
writing additional pages... search done
copying images... [100%] _static/images/comet-system-diagram.png
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded.

The HTML pages are in build/html.

This is what the build looks like on main.

./build.sh 
Running Sphinx v7.1.2
making output directory... done
[autosummary] generating autosummary for: contributor-guide/contributing.md, contributor-guide/debugging.md, contributor-guide/development.md, contributor-guide/plugin_overview.md, index.rst, user-guide/compatibility-template.md, user-guide/compatibility.md, user-guide/configs-template.md, user-guide/configs.md, user-guide/datatypes.md, user-guide/expressions.md, user-guide/installation.md, user-guide/operators.md, user-guide/overview.md
myst v2.0.0: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'deflist', 'colon_fence', 'tasklist'}, disable_syntax=[], all_links_external=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=3, heading_slug_func=None, html_meta={}, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=True, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True)
building [mo]: targets for 0 po files that are out of date
writing output... 
building [html]: targets for 14 source files that are out of date
updating environment: [new config] 14 added, 0 changed, 0 removed
reading sources... [100%] user-guide/overview
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/index.rst:51: WARNING: Duplicate explicit target name: "toc.links".
looking for now-outdated files... none found
pickling environment... done
checking consistency... /Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/user-guide/compatibility-template.md: WARNING: document isn't included in any toctree
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/user-guide/configs-template.md: WARNING: document isn't included in any toctree
done
preparing documents... done
copying assets... copying static files... done
copying extra files... done
done
writing output... [100%] user-guide/overview
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/contributor-guide/debugging.md:51: WARNING: Pygments lexer name 'JDK8' is not known
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/contributor-guide/debugging.md:59: WARNING: Pygments lexer name 'JDK9' is not known
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/contributor-guide/debugging.md:132: WARNING: Pygments lexer name 'commandline' is not known
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/user-guide/installation.md:43: WARNING: Pygments lexer name 'commandline' is not known
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/user-guide/installation.md:49: WARNING: Pygments lexer name 'commandline' is not known
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/user-guide/installation.md:56: WARNING: Pygments lexer name 'commandline' is not known
/Users/thauck/personal/code/github.com/tshauck/arrow-datafusion-comet/docs/temp/user-guide/installation.md:64: WARNING: Pygments lexer name 'commandline' is not known
generating indices... genindex done
highlighting module code... 
writing additional pages... search done
copying images... [100%] _static/images/comet-system-diagram.png
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded, 10 warnings.

The HTML pages are in build/html.

Manually reviewed HTML too.

[andygrove]

Thank you for cleaning this up @tshauck

[andygrove]

That is much nicer