[x/blog] CONTRIBUTING.md: remove note about not accepting Pull Requests
[x/blog] CONTRIBUTING.md: remove note about not accepting Pull Requests

Updates golang/go#24185

Change-Id: I7f19310ff4dba014c3dff9b7d7791bfdcb4ebd44
Reviewed-on: https://go-review.googlesource.com/100677
Reviewed-by: Andrew Bonventre <682ad9f487f614f19e8b7cc5d340bdc8e1c1b128@golang.org>
X-Blog-Commit: bd9deed42368b2f8e372f04507bcc133caca296d

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website