Replace all instances of <p/> with <p> to follow Oracle standards.

As per the link below, the standard for using paragraph tags it to simply use `<p>` and not use closing tags.

http://www.oracle.com/technetwork/java/javase/documentation/index-137868.html#format

Signed-off-by: Steven Downer <grinch@outlook.com>
Merge pull request #571 from Grinch/patch-1

Replace all instances of <p/> with <p> to follow Oracle standards.