docs(NgMessages): fix up links and headings
docs(directive): fix misspelled HTML class for an alert

Muchas gracias

Closes #7381
docs(Scope): fix typo in a link

Closes #7389
docs(ngCookies): correct arguments in $cookieStore example

Closes #7390
docs(dateFilter): correct example for date 'fullDate filter'

The equivalent expanded example for 'fullDate' is given as 'EEEE, MMMM d,y'
whereas it should be 'EEEE, MMMM d, y'. With added whitespace.

Closes #7350
docs(CONTRIBUTING.md): anchor fix

"Follow our Coding Rules" should link to "#rules" and not "#coding-rules"

Closes #7349