[1.2.X] Fixed #14783 - Links + style improvements to docs/topics/email.txt....

[1.2.X] Fixed #14783 - Links + style improvements to docs/topics/email.txt. Thanks adamv for the patch.

Backport of r14723 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14724 bcc190cf-cafb-0310-a4f2-bffc1f526a37