Remove duplicated MakeClicky documentation

The docs added in 224edae0 were a merely a copy of the <%doc> block in /Elements/MakeClicky; stop forcing changes to be made in what are effectively two equal documents.  The docs/ version is POD-formatted, and more discoverable, so keep that copy.
Merge branch '4.0/remove-duplicate-makeclicky-docs' into 4.0-trunk