Properly parse a PSQL server version, even beta versions. Fixes #6352.
Formatting fixes.

* Double to single quotes.
* Wrap CLI examples.
* Removed unneeded commas from `.format()` call arguments.
* Replaced string substitutions(ie, `%s`) with string formatting(`.format()`)
Typo.
Merge pull request #6398 from s0undt3ch/issues/6352-parser-psql-beta-version

Properly parse a PSQL server version, even beta versions