Sandra Loosemore appointed docs maintainer

[Gerald Pfeifer]

For those of you following gcc-patches this may not be the most
terrible surprise given what she has been contributing the last
couple of months alone.  That said....

I am happy to announce Sandra Loosemore as docs maintainer.

Thanks for all the improvements you have contributed so far,
Sandra, and we are looking forward towards a continuing and
fruitful collaboration.

Congratulations and Happy Editing!

Gerald

PS: For those of you wondering why MAINTAINERS reads "docs co-maintainer", 
that is to emphasize that all maintainers can and should and are most 
welcome to contribute and refine documentation in their respective areas.