docs(ngdoc): ensure module installation docs are accurate

The ngMock module is built into a package called angular-mocks, which is
not named consistently and the docs were giving invalid info.

Closes #5810
docs(guide/filter): link to an example of a filter unit test
feat($animate): provide support for a close callback

Closes #5685
Closes #5053
Closes #4993
docs(search): make sure the forward slash doesn't focus on search while on another input element

Closes #5969
docs(changelog): release notes for 1.2.10
chore(release): cut v1.2.10 release
chore(release): start v1.2.11 (1.2.11)
chore(release): update cdn version