The comment tag in ERB is `<%#`

http://apidock.com/ruby/ERB

The space in this line raises a syntax error when copied to the live page.
Make other comments consitent to avoid confusion

As noted in the previous commit, the comment tag for ERB is `<%#`. These lines
work as comments because they are the first thing in the file; however, correcting
them to avoid confusion.
Merge pull request #649 from alphagov/fix-notifications

Correct ERB comment tag