[1.9.x] Fixed typo in docs/ref/forms/validation.txt.

Backport of 1aa8bf9b43bbc214770389b9b8d084552040fa44 from master
This commit is contained in:
Andrew Plummer 2015-12-09 10:43:20 +00:00 committed by Tim Graham
parent 55fa19e4a6
commit 3f9fbf4243