chore(docs): clarify comment which was copy&paste from dgeni example

It makes people happy, so why not

Closes #9798
docs(guide/*): fix typos and links

Fix some typos and link-errors introduced in
https://github.com/angular/angular.js/commit/d1ccf176351cda2b49599374c7d4ba594796012f.

Related to #9786
Closes #9800
feat($anchorScroll): add support for scrolling independently of `$location.hash()`

Add an optional argument to `$anchorScroll()` to enable scrolling to an
anchor element different than that related to the current value of
`$location.hash()`. If the argument is omitted, the value of
`$location.hash()` will be used instead.

Closes #4568