[Boost-build] Patched the comment block processing in the utils/doc.jam module.

From: Jurko Gospodnetiæ (jurko.gospodnetic_at_[hidden])
Date: 2008-08-23 07:54:49

   Hi.

   Just updated the comment parsing logic in Boost Build's util/doc.jam 
module. Now correctly recognizes comment blocks starting with an empty 
line and correctly parses comment lines where the initial # character is 
followed by a non-whitespace characters.

   This for example allows it to correctly process comments written like 
this:

> ######################################
> #
> # An example comment.
> #
> ######################################

   Which would previously not get interpreted as valid module 
description comment blocks.

   Changeset link: http://svn.boost.org/trac/boost/changeset/48313

   Best regards,
     Jurko Gospodnetiæ