MAINTAINERS: Add jsnow as maintainer for Sphinx documentation

Since I've just about rewritten the entirety of the QAPI documentation
system, it's probably fair that I be the contact point for if it goes
awry.

Signed-off-by: John Snow <[email protected]>
Message-ID: <[email protected]>
Acked-by: Markus Armbruster <[email protected]>
Signed-off-by: Markus Armbruster <[email protected]>

Author: jnsnow

MAINTAINERS

@@ -4325,6 +4325,7 @@ S: Orphan
 F: po/*.po
 
 Sphinx documentation configuration and build machinery
+M: John Snow <[email protected]>
 M: Peter Maydell <[email protected]>
 S: Maintained
 F: docs/conf.py