[Lazarus] wikiconvert to fpdoc format using outdated structure for xml generation

[Andreas Frieß]

beside the discussion of singular or plural of fpdoc-descriptionS :-)

the wikconvert can't handle the minus (Mantis 0027362). In 
wiki2fpdocconvert.pas around line 283 the function IsValidId is used. 
This Routine from sysstr.inc 'System Utilities For Free Pascal' doesnt 
accept a minus as a valid char.