fix external link
fix more words
Merge pull request #833 from samsonasik/fix/external.link

fix external link and surplus word
typo: needed a slash in one of the paths
Update zend.form.collections.rst
Merge pull request #834 from bickerstoff/fix/tutorial/unittesting

typo: needed a slash in one of the paths
Merge pull request #835 from Danizord/patch-3

Typo fix
Merge branch 'master' into develop