docs(ngPluralize): spell Mary's name correctly

Update ngPluralize.js

Just a silly change to the name of one of the examples that appears to be a typo. Changing Marry to
Mary as the first would be a verb and the latter would be an extremely common name.

Closes #7884
docs(tutorial/step-4): fix e2e test

After a protractor update the test syntax had to be changed.

Closes #7919
docs(ngMessages): correct a typo

Closes #7918
fix(Angular): nodeName should always be lowercase

XHTML uses lowercase node names, while HTML often uses uppercase.  The
generally accepted convention is to always lowercase them.

Fixes #3987