[DOCS-14678] Document search_string regex behavior when exact_match is false

[domalessi]

What does this PR do? What is the motivation?

Fixes DOCS-14678

Adds a note and before/after YAML example to the Process Check README documenting that search_string values are interpreted as Python regular expressions using re.search() when exact_match is set to false. Regex metacharacters must be escaped for literal matching.

This behavior was undocumented and caused a customer's process check monitor to fail to detect a running Java process containing . and + in the path.

Merge instructions

Merge readiness:

• Ready for merge

Additional notes

Review from jeff-morgan-dd is dismissed. Related teams and files:

• documentation
  • process/README.md

[jeff-morgan-dd]

LGTM!

[dd-octo-sts]

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