Fixed frontend documentation.  'parameter' attribute description was incomplete.  Removed the attribute name 'const' since it is not defined for frontend attrs.
Fixed frontend documentation.  'parameter' attribute description was incomplete.  Removed the attribute name 'const' since it is not defined for frontend attrs.

bbockelm/glideinWMS,bbockelm/glideinWMS,bbockelm/glideinWMS,bbockelm/glideinWMS