User Guide update - Query Builder (fixes #2512)

1) Changed the grouping for better readability, in the query builder writeup
2) Added return value descriptors for all methods
3) Added default setting to query builder configuration writeup.

The TOC sidebar is much better than before, though still a bit messy. This will need fixing with the sphinx theme update, being done separately.

Signed-off-by:James L Parry <jim_parry@bcit.ca>
Merge pull request #3373 from jim-parry/userguide/querybuilder

User Guide update - Query Builder (fixes #2512)
Merge branch 'develop' of github.com:bcit-ci/CodeIgniter into userguide/metadata
User Guide update - Datbase Utilities

1) Updated TOC structure of the DB Utilities writeup
2) Added a class reference at the end, ordered by method name
Signed-off-by:James L Parry <jim_parry@bcit.ca>
User Guide update - Metadata

Removed return types ... that needs to go in the DB driver reference
Signed-off-by:James L Parry <jim_parry@bcit.ca>