Hygiene: Cleanup PHPDocs

* comments should not not use curly braces
* No need for ':' symbol
* use lowercase for native types
* In parameters put type first
See http://manual.phpdoc.org/HTMLSmartyConverter/
HandS/phpDocumentor/tutorial_tags.param.pkg.html

Change-Id: I06a21b18bba5b945c20585a20ff121e4e17bfb29
Merge "Hygiene: Cleanup PHPDocs"