[FE-discuss] PATCH: documentation on how to make sure one date is before another

[Matthew Wilson]

I wrote a blog post today with a description on how to verify one date
field is before another. This patch contains the text of that blog
post along with a new "Examples" section to the bottom of
Validator.txt.

There is some weirdness going on with the headings in the new examples
section. I tried to use toctree but couldn't figure it out, so
hopefully somebody else can tweak this so it is more useful.

Matt