net/http: fix doc comment on FormValue function
This function checks Request.Form, which now includes values parsed from a PATCH request.
Fixes #60585
Change-Id: Icb095d9ac2f8b0c5dbf313e507ed838cb941517f
GitHub-Last-Rev:
3a477ea97e27f5b31d28085df75163fc13541c13
GitHub-Pull-Request: golang/go#61591
Reviewed-on: https://go-review.googlesource.com/c/go/+/513435
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Damien Neil <dneil@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Damien Neil <dneil@google.com>