Add documentation for the (nonlocal ...) directive
Add documentation for the (nonlocal ...) directive

Signed-off-by: Gregor Best <8f1ca2a348912e16236a8917e62a31c087708057@unobtanium.de>

kartikm/hy,Tritlo/hy,ALSchwalm/hy,timmartin/hy,adamfeuer/hy,zackmdavis/hy,tuturto/hy,jakirkham/hy,gilch/hy,freezas/hy,paultag/hy,algernon/hy,mtmiller/hy,michel-slm/hy