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(parent: 4d0fc1d) | patch

Fix documentation of regular expression character-entry escapes.

Fix documentation of regular expression character-entry escapes.

The docs claimed that \uhhhh would be interpreted as a Unicode value
regardless of the database encoding, but it's never been implemented
that way: \uhhhh and \xhhhh actually mean exactly the same thing, namely
the character that pg_mb2wchar translates to 0xhhhh. Moreover we were
falsely dismissive of the usefulness of Unicode code points above FFFF.
Fix that.

It's been like this for ages, so back-patch to all supported branches.

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