First round of changes

Just tidying up a few things.
Slight edit
update
Update how-to-add-last-post-prefix-forum.md
Update how-to-add-last-post-prefix-forum.md
Update how-to-add-last-post-prefix-forum.md
Update how-to-add-last-post-prefix-forum.md
Text updates
updating text
Update how-to-add-last-post-prefix-forum.md
more updates
Update how-to-add-last-post-prefix-forum.md
Update how-to-add-last-post-prefix-forum.md
Update how-to-add-last-post-prefix-forum.md
Update how-to-add-last-post-prefix-forum.md
Text updated
Text updated
Merge pull request #1 from AstonJ/master

Text changes (thanks AstonJ)