Update documentation by adding vdldoc: prefix to vlddoc elements in taglib.xml tags, adding missing since tags, and adding el variable documentation where applicable

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: liferay-faces-2.1.3-ga4, liferay-faces-3.0.3-legacy-ga4, liferay-faces-3.0.3-ga4, liferay-faces-3.1.3-ga4
• Fix Version/s: liferay-faces-2.1.4-ga5, liferay-faces-2.2.4-ga5, liferay-faces-3.0.4-legacy-ga5, liferay-faces-3.0.4-ga5, liferay-faces-3.1.4-ga5, liferay-faces-3.2.4-ga5
• Component/s: Liferay Faces Alloy / Showcase / Tests, Liferay Faces Bridge Impl / Demos / Tests, Liferay Faces Portal / Demos / Tests
• Labels: None

This task requires the addition <vdldoc:since> elements to taglib.xml tags and composite component tags. This task also requires that a xmlns:vdldoc section be added to the facelet-taglib element (for taglib.xml files) and the ui:component element (for facelet composite components). Inside the taglib.xml it is also necessary to specify the schema location of the vdldoc .xsd file.

This task also requires that a liferay.taglib.xml file be added to define el variables for documentation.