prosody.cfg.lua.dist: Remove comment about mod_*.lua above modules_enabled

This is a very old statement, but people generally don't need to check for the
files, and shouldn't be encouraged to put them in Prosody's source dir. The
installer will be the way forward for most people, and hg for the rest.

Manually moving files into the right place is not something most users should
be doing.

prosody.cfg.lua.dist

@@ -29,7 +29,6 @@ admins = { }
 --plugin_paths = {}
 
 -- This is the list of modules Prosody will load on startup.
--- It looks for mod_modulename.lua in the plugins folder, so make sure that exists too.
 -- Documentation for bundled modules can be found at: https://prosody.im/doc/modules
 modules_enabled = {