docs(dev-guide/tracing): make "Adding instrumentation" a level-2 title #4112
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In #3873, mentions of
cfg_attr()
instrumentation under theotel
flag have been mostly regex-replaced to under no particular flag at all.However, this also means that "Adding instrumentation" now applies to more cases and should no longer be put under the "Opentelemetry tracing" level-2 title.
This PR has fixed that issue.