Add docs on: TCP keepalive updates; schema.auto_unlock variable; fuzzystrmatch extension

[rmloveland]

Fixes DOC-16221

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Files changed:

• src/current/_includes/v26.2/cdc/cdc-schema-locked-example.md:
• src/current/v26.2/changefeed-best-practices.md
• src/current/v26.2/create-changefeed.md
• src/current/_includes/v26.2/misc/session-vars.md:
• src/current/v26.2/show-vars.md
• src/current/v26.2/set-vars.md
• src/current/v26.2/session-variables.md
• src/current/_includes/v26.2/misc/table-storage-parameters.md:
• src/current/v26.2/with-storage-parameter.md
• src/current/v26.2/alter-table.md
• src/current/v26.2/online-schema-changes.md
• src/current/v26.2/sql-feature-support.md

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Diagram Anchor Check: Passed

All sql-grammar.html#anchor references in SQL diagram files resolve correctly against stmt_block.html.

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[rmloveland]

hey @rafiss i batched up the unrelated "papercuts" changes you mentioned in your comment on DOC-16221 into this one PR, hope that's ok!

[rafiss]

lgtm overall!

this is separate from this PR, but at some point i'd be interested in doing what i can to help the docs pages automatically get updated with new session variables. a table with descriptions gets auto-generated in the CRDB code base here: https://github.com/cockroachdb/cockroach/blob/master/docs/generated/sql/session_vars.md

[rmloveland]

this is separate from this PR, but at some point i'd be interested in doing what i can to help the docs pages automatically get updated with new session variables. a table with descriptions gets auto-generated in the CRDB code base here: https://github.com/cockroachdb/cockroach/blob/master/docs/generated/sql/session_vars.md

sorry, forgot to reply to this earlier

I remember that you did this work in the DB a while ago, and have an issue open to work on this

https://cockroachlabs.atlassian.net/browse/DOC-12507

Thanks for the reminder, I will work on this ASAP after the v26.2 release!