Improve grammar, style, and consistency in the Behavior docs.

[thenickcox]

This commit makes relatively minor grammatical and stylitic changes
to improve the clarity of the Behavior docs. In addition, for the
sake of consistency, the singular forms of both Behavior and
View have been wrapped in backticks (<code> tags in the compiled
HTML) to match what seemed to be the preference based on the rest of
the document. Further, the established practice seemed to have been
to capitalize both "Behaviors" and "Views", but not to wrap them
in <code> tags, so this fixes a few stragglers in that regard.

[jasonLaster]

Thanks for the help!