[help-texinfo] @uref and workaround for URL containing commas

[Federico Bruni]

Hi all

I'm trying to address the problem described here:
https://sourceforge.net/p/testlilyissues/issues/4848/

This is the link:
@uref{http://imslp.org/wiki/Repository_of_Music-Notation_Mistakes_%28Coulon,_Jean-Pierre%29, 
this book}

I found only this discussion in the archives:
https://lists.gnu.org/archive/html/help-texinfo/2002-09/msg00019.html

I tried to use the workaround suggested there, in the following way:

@set urlComma 
http://imslp.org/wiki/Repository_of_Music-Notation_Mistakes_%28Coulon,_Jean-Pierre%29
@address@hidden, this book}

but didn't work.

I don't know if this is handled by makeinfo or texi2html (lilypond 
documentation still depends on it):

$ texi2html --version
1.82

$ makeinfo --version
texi2any (GNU texinfo) 6.0


Thanks in advance
Federico