fix(docs): clarify doc for "args" in $broadcast and $emit

Closes #6047.
Edited the 'Flushing HTTP requests' section

Minor grammatical edits in the Flushing HTTP requests section.
fix(input): setViewValue on compositionend

Because of a4e6d962, model is not updated on input/change between the
compositionstart and compositionend events. Unfortunately, the compositionend
event does not always happen prior to an input/change event.

This changeset calls the listener function to update the model after a
compositionend event is received.