docs(directive): Fix entity confusion in example.
docs(filter): Using indefinite article

This doc was using both definite article and indefinite article at the same time.
chore(Angular): remove superfluous fromCharCode function

Remove fromCharCode function as it was used only in two inner
functions in the code, and its functionality is achieved in several
other places by using String.fromCharCode

Breaks fromCharCode closure function, String.fromCharCode should be
used instead