Update monolog.rst

Changed \n => &#xA; in xml example.
[Book] [Security] Fix typo
Adding the mapped type to the form type references
Refactored Doc Standards into its own file
Added heading level standard
Added hyperlink standard
Added formats standards
Refactored docs to use adders/removers
[#2555] Tweaking JSON Hijacking note to add a bit more information that Fabpot added
Merge pull request #2481 from WouterJ/doc_standards

Refactored Doc standards
[#2481] Tweaks to new docs standards doc
added assetic DIC tags
Merge pull request #2434 from WouterJ/add_remove

Refactored docs to use adders/removers
Fixing outdated reference to the form "field" type
[#2434] Rearranging some new notes about adders and removers in the collection type
Merge pull request #2480 from pvolok/assetic_tags

Add assetic DIC tags reference.
[#2480] Tweaks to new Assetic DIC tags
Update data_transformers.rst

Update getDoctrine()->getEntityManager() to getDoctrine()->getManager()
Merge pull request #2488 from burci/bug-xml-newline

[cookbook][logging]Bug in xml monolog format example
Merge pull request #2490 from michaelperrin/bugfix/security-typo

[Book] [Security] Fix typo