Removed jruby-openssl gem from default template Gemfile
Some editorial changes on the documentation.

* Remove some autolinks
* Fix the rendered result
* Change sql to SQL

[ci skip]
Merge pull request #10556 from Empact/deprecate-schema-statements-distinct

Deprecate SchemaStatements#distinct, and make SchemaStatements#columns_for_distinct nodoc.
Conflicts:
	activerecord/CHANGELOG.md
Add CHANGELOG entry for #10576

[ci skip]
Fix typo: require -> requires

[ci skip]
Merge pull request #10560 from jkutner/master

Remove jruby-openssl from default Gemfile