DOC: Fix issues in Transform and TransformBaseTemplate

In Transform, explicit newlines in the class documentation comment to
cause the HTML documentation text to layout properly.

In TransformBaseTemplate, the template parameter should be named TScalar,
both for style correctness, and to cause the Doxygen inheritance diagram
to properly generate.

Change-Id: Id407b2f3be7eff77e807eed1dbaf618ed135c689
Merge topic 'Doc-Transform'

85b2abd DOC: Fix issues in Transform and TransformBaseTemplate