Tidy up "traffic shaper" XHTML

Close INPUT, BR and P tags
Update PHP Shorthand tag
Spelling mistake
Move "tree.css" and "tree.js" to the HEAD statement and close the HEAD
statement manually
Deprecate the ampersand in the ANCHOR tag
Merge pull request #489 from ExolonDX/branch_01

Tidy up "traffic shaper" XHTML