Notify T-rustdoc for beta-accepted and stable-accepted too

Otherwise, it's unclear when the nomination label is removed whether the
backport was accepted, thus nomination removed, or if the backport was
rejected, thus nomination removed.

triagebot.toml

@@ -452,6 +452,19 @@ message_on_remove = "PR #{number}'s beta-nomination has been removed."
 message_on_close = "PR #{number} has been closed. Thanks for participating!"
 message_on_reopen = "PR #{number} has been reopened. Pinging @*T-rustdoc*."
 
+# FIXME: Patch triagebot to support `notify-zulip.<label>` getting mapped to an array of actions.
+#        At the moment, the beta-accepted+T-rustdoc action fully occupies the beta-accepted slot
+#        preventing others from adding more beta-accepted actions.
+[notify-zulip."beta-accepted"]
+required_labels = ["T-rustdoc"]
+zulip_stream = 266220 # #t-rustdoc
+# Put it in the same thread as beta-nominated.
+topic = "beta-nominated: #{number}"
+message_on_add = "PR #{number} has been **accepted** for beta backport."
+message_on_remove = "PR #{number}'s beta-acceptance has been **removed**."
+message_on_close = "PR #{number} has been closed. Thanks for participating!"
+message_on_reopen = "PR #{number} has been reopened. Pinging @*T-rustdoc*."
+
 # FIXME: Patch triagebot to support `notify-zulip.<label>` getting mapped to an array of actions.
 #        At the moment, the stable-nominated+T-rustdoc action fully occupies the stable-nominated slot
 #        preventing others from adding more stable-nominated actions.
@@ -476,6 +489,19 @@ message_on_remove = "PR #{number}'s stable-nomination has been removed."
 message_on_close = "PR #{number} has been closed. Thanks for participating!"
 message_on_reopen = "PR #{number} has been reopened. Pinging @*T-rustdoc*."
 
+# FIXME: Patch triagebot to support `notify-zulip.<label>` getting mapped to an array of actions.
+#        At the moment, the stable-accepted+T-rustdoc action fully occupies the stable-accepted slot
+#        preventing others from adding more stable-accepted actions.
+[notify-zulip."stable-accepted"]
+required_labels = ["T-rustdoc"]
+zulip_stream = 266220 # #t-rustdoc
+# Put it in the same thread as stable-nominated.
+topic = "stable-nominated: #{number}"
+message_on_add = "PR #{number} has been **accepted** for stable backport."
+message_on_remove = "PR #{number}'s stable-acceptance has been **removed**."
+message_on_close = "PR #{number} has been closed. Thanks for participating!"
+message_on_reopen = "PR #{number} has been reopened. Pinging @*T-rustdoc*."
+
 [notify-zulip."I-types-nominated"]
 zulip_stream = 326866 # #T-types/nominated
 topic = "#{number}: {title}"