CONTRIBUTING.md: remove note about not accepting Pull Requests

Updates golang/go#24185

Change-Id: Ic2d895e46e2aac8ccf4ac835a3c945cfaaec65b8
Reviewed-on: https://go-review.googlesource.com/100717
Reviewed-by: Andrew Bonventre <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: andybons

CONTRIBUTING.md

@@ -4,16 +4,15 @@ Go is an open source project.
 
 It is the work of hundreds of contributors. We appreciate your help!
 
-
 ## Filing issues
 
 When [filing an issue](https://golang.org/issue/new), make sure to answer these five questions:
 
-1. What version of Go are you using (`go version`)?
-2. What operating system and processor architecture are you using?
-3. What did you do?
-4. What did you expect to see?
-5. What did you see instead?
+1.  What version of Go are you using (`go version`)?
+2.  What operating system and processor architecture are you using?
+3.  What did you do?
+4.  What did you expect to see?
+5.  What did you see instead?
 
 General questions should go to the [golang-nuts mailing list](https://groups.google.com/group/golang-nuts) instead of the issue tracker.
 The gophers there will answer or ask you to file an issue if you've tripped over a bug.
@@ -23,17 +22,17 @@ The gophers there will answer or ask you to file an issue if you've tripped over
 In order to verify changes to the slides or code examples while developing
 locally compile with your local toolchain:
 
-	$ go install golang.org/x/tour/gotour
-	$ $GOPATH/bin/gotour
+    $ go install golang.org/x/tour/gotour
+    $ $GOPATH/bin/gotour
 
 ## Running the App Engine version locally
 
 To view the App Engine version of the slides while developing locally, install
 the [Go App Engine SDK](https://cloud.google.com/appengine/downloads?hl=en)
 and then:
 
-	$ cd $GOPATH/src/golang.org/x/tour
-	$ $SDK_PATH/dev_appserver.py .
+    $ cd $GOPATH/src/golang.org/x/tour
+    $ $SDK_PATH/dev_appserver.py .
 
 The App Engine version runs code examples against the service at play.golang.org.
 To verify changes to the code examples you must use your local toolchain to compile
@@ -44,9 +43,5 @@ and run `gotour` locally.
 Please read the [Contribution Guidelines](https://golang.org/doc/contribute.html)
 before sending patches.
 
-**We do not accept GitHub pull requests**
-(we use [Gerrit](https://code.google.com/p/gerrit/) instead for code review).
-
 Unless otherwise noted, the Go source files are distributed under
 the BSD-style license found in the LICENSE file.
-