[Code Style] Concat operator must be followed by one space

Fix missing spaces before and after concat operator at
/administrator/components/com_admin/views/help/tmpl/default.php

Line:	38
Column:	49
Merge pull request #2694 from javigomez/code_style1

[Code Style] Concat operator must be followed by one space
Merge remote-tracking branch 'upstream/master'