ZF-8962 #comment added manual chapter/section with description and examples for Zend_Filter_HtmlEntities. Also added 3 new unit tests.
ZF-8962 #comment added manual chapter/section with description and examples for Zend_Filter_HtmlEntities. Also added 3 new unit tests.

git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@22244 44c647ce-9c0f-0410-b52a-842ac1e357ba

delboy1978uk/zend-filter,MadCat34/zend-filter,zendframework/zend-filter,Maks3w/zend-filter