[libnice] Please add documentation for G_MESSAGES_DEBUG

[Philip Withnall]

On Fri, 2014-12-26 at 23:20 +0100, Stephan Thamm wrote:
> Hi,
> I was trying to debug a project which uses libnice and was not able to get 
> debugging output from it for several days. Today I finally stumbled upon 
> `G_MESSAGES_DEBUG=all` in a mailing list thread.
> 
> Please add a reference to this environment variable in the section about 
> nice_debug_enable().

Good idea. Done in commit c6fa14f4fe10f04e1b9a4c231caa8054e0c7224d.

Philip
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