* [DOCS][ESQL] Flip preview booleans, to GA search functions
* render docs, tweak some applies_to metadata in docs gen code
- **rendered docs (md):**
- kql: removed serverless preview, added ga 9.1.0
- match: removed serverless preview, added ga 9.1.0
- match_phrase: changed from preview 9.1.0 to unavailable 9.0 + ga 9.1.0
- qstr: removed serverless preview, added ga 9.1.0
- search functions list: removed bullet point before term function
- **docs generation code (java):**
- match_phrase: updated function info annotations to unavailable 9.0 + ga 9.1.0
- query_string: uncommented ga 9.1.0 annotation
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