User Guide Tuning

Adjust the heading levels in the writeups for the input, loader, security and unit testing libraries, to match the other library writeups.
Specifically, the class reference section in each of these was appearing as a sub-level in the toctree, when it should be at the same level.
Signed-off-by:James L Parry <jim_parry@bcit.ca>
Merge pull request #3429 from jim-parry/userguide/fix-reference-level

User Guide Tuning
fix typo in the comments
Merge pull request #3437 from galdiolo/develop

[ci skip] fix a comment typo
use $title variable in the view

$data['title'] is defined in the controller but it is not used in the view
fix typo

need need -> need
fix path for individual news item

href resolves to index.php/slug instead of index.php/news/slug
use $title variable in the view

$data['title'] is defined in the controller but it is not used in the view
Merge pull request #3439 from galdiolo/patch-1

[ci skip] use $title variable in the view
Merge pull request #3441 from galdiolo/patch-3

[ci skip] fix a typo
Merge pull request #3442 from galdiolo/patch-4

[ci skip] fix path for individual news item
update readme
update