[Pidgin] #4638: Replace duplicated documentation with @copydoc

[Pidgin]

#4638: Replace duplicated documentation with @copydoc
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 Reporter:  resiak        |       Owner:  resiak
     Type:  task          |      Status:  new   
 Priority:  minor         |   Milestone:        
Component:  unclassified  |     Version:  2.3.1 
 Keywords:                |     Pending:  0     
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 While perusing the Doxygen docs, I discovered
 [http://www.stack.nl/~dimitri/doxygen/commands.html#cmdcopydoc this
 command]:

   {{{ \copydoc <link-object>}}}

   Copies a documentation block from the object specified by <link-object>
 and pastes it at the location of the command. This command can be useful
 to avoid cases where a documentation block would otherwise have to be
 duplicated or it can be used to extend the documentation of an inherited
 member.

 There are quite a few places where docs are copy-pasted.  This should
 probably be used instead.

-- 
Ticket URL: <http://developer.pidgin.im/ticket/4638>
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