Update Session Store Documentation

session_id doesn't need to be a text column, just string (VARCHAR)
Merge pull request #13315 from tyre/patch-1

Update Session Store Documentation
Fix force_ssl.rb documentation. Close tt tag.

[ci skip]
Merge pull request #13613 from simi/patch-1

Fix force_ssl.rb documentation. Close tt tag.
Escape format, negative_format and units options of number helpers

Previously the values of these options were trusted leading to
potential XSS vulnerabilities.

Fixes: CVE-2014-0081
Use the reference for the mime type to get the format

Before we were calling to_sym in the mime type, even when it is unknown
what can cause denial of service since symbols are not removed by the
garbage collector.

Fixes: CVE-2014-0082
Preparing for 3.2.17 release
Merge branch '3-2-17' into 3-2-stable

Conflicts:
	actionpack/CHANGELOG.md