cmd/releasebot: document that all release types are supported

Releasebot has achieved the milestone of supporting all release
types some time ago. Let it have this badge of honor, so it can
celebrate and show off to its robot friends.

Also adjust the phrasing in nextStepsPrepare and nextStepsBeta
to be more clear when only the prepare stage has completed.

For golang/go#34045.

Change-Id: Ie4771ab6b6692a26c3363a3a35f131edd2d569cf
Reviewed-on: https://go-review.googlesource.com/c/build/+/239038
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
diff --git a/cmd/releasebot/README.md b/cmd/releasebot/README.md
index e49f60c..e915dfb 100644
--- a/cmd/releasebot/README.md
+++ b/cmd/releasebot/README.md
@@ -4,11 +4,9 @@
 
 The release happens in two stages:
 
-* the `prepare` stage checks preconditions, and if needed makes the release commit and mails it for review;
+* the `prepare` stage checks preconditions, makes the release commit and mails it for review (if applicable), and performs testing;
 * the `release` stage runs after the release commit (if any) is merged, and it tags, builds and cleans up the release.
 
-At the moment only minor and beta releases are supported.
-
 ## Permissions
 
 The user running a release will need:
diff --git a/cmd/releasebot/main.go b/cmd/releasebot/main.go
index afe4094..394af82 100644
--- a/cmd/releasebot/main.go
+++ b/cmd/releasebot/main.go
@@ -2,9 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Releasebot manages the process of defining, packaging, and publishing Go
-// releases. It is a work in progress; right now it only handles beta, rc and
-// minor (point) releases, but eventually we want it to handle major releases too.
+// Releasebot manages the process of defining,
+// packaging, and publishing Go releases.
 package main
 
 import (
@@ -483,7 +482,7 @@
 	if w.Security {
 		w.log.Printf(`
 
-The release is ready.
+The prepare stage has completed.
 
 Please review and submit https://team-review.git.corp.google.com/q/%s
 and then run the release stage.
@@ -494,7 +493,7 @@
 
 	w.log.Printf(`
 
-The release is ready.
+The prepare stage has completed.
 
 Please review and submit https://go-review.googlesource.com/q/%s
 and then run the release stage.
@@ -505,7 +504,9 @@
 func (w *Work) nextStepsBeta() {
 	w.log.Printf(`
 
-The release is ready. Run with mode=release to execute it.
+The prepare stage has completed.
+
+Please run the release stage next.
 
 `)
 }
@@ -513,9 +514,9 @@
 func (w *Work) nextStepsRelease() {
 	w.log.Printf(`
 
-The release run is complete! Refer to the playbook for the next steps.
+The release stage has completed. Thanks for riding with releasebot today!
 
-Thanks for riding with releasebot today.
+Please refer to the playbook for the next steps.
 
 `)
 }