[ci skip] Add notes to get_compiled_insert(), get_compiled_update() docs
Merge remote-tracking branch 'codeigniter/develop'
[ci skip] Fix a changelog message
EXISTS / NOT EXISTS clause support for  DB_query_builder.
EXISTS / NOT EXISTS clause support for  DB_driver
EXISTS / NOT EXISTS clause support for  DB_driver
changed EXISTS / NOT EXISTS pattern
@narfbg "It has parenthesis, so use the IN / NOT IN pattern as a base."
added changelog about EXISTS / NOT EXISTS
@narfbg "And you should also add a changelog entry for this addition. :)"
so we need \sNOT EXISTS
Merge pull request #2781 from tufanbarisyildirim/develop

EXISTS / NOT EXISTS clause support for  DB_driver
Polishing changes from #PR #2781

Looks like an unnecessary commit was made by the author just as I was clicking the Merge button. :)
Merge remote-tracking branch 'codeigniter/develop'