Fixing spelling found by new typos release (v1.27.0)

[jsiirola]

Fixes # .

Summary/Motivation:

This fixes spelling errors detected by the new release of the typos package (v1.27.0)

Changes proposed in this PR:

• Change one search pattern in the pyomo help processing. This should not change the current behavior
• NFC: fix spelling errors.

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[jsiirola]

(The failing Jenkins tests are due to an Xpress license issue unrelated to this PR, and will be resolved by a separate PR. Merging this PR...)