Move `.m.rule.roomnotif` before `.m.rule.tombstone` (#1421)

See https://github.com/matrix-org/matrix-spec/issues/1406 for the reasoning on
this. TL;DR: the spec has always been wrong here.

changelogs/client_server/newsfragments/1421.clarification

@@ -0,0 +1 @@
+Correct the order of the default override pushrules in the spec.

content/client-server-api/modules/push.md

@@ -524,29 +524,27 @@ Definition:
 }
 ```
 
-**<a name="mruletombstone"></a>`.m.rule.tombstone`**
+**`.m.rule.roomnotif`**
 
-Matches any state event whose type is `m.room.tombstone`. This is
-intended to notify users of a room when it is upgraded, similar to what
-an `@room` notification would accomplish.
+Matches any message whose content is unencrypted and contains the text
+`@room`, signifying the whole room should be notified of the event.
 
 Definition:
 
 ```json
 {
-    "rule_id": ".m.rule.tombstone",
+    "rule_id": ".m.rule.roomnotif",
     "default": true,
     "enabled": true,
     "conditions": [
         {
             "kind": "event_match",
-            "key": "type",
-            "pattern": "m.room.tombstone"
+            "key": "content.body",
+            "pattern": "@room"
         },
         {
-            "kind": "event_match",
-            "key": "state_key",
-            "pattern": ""
+            "kind": "sender_notification_permission",
+            "key": "room"
         }
     ],
     "actions": [
@@ -558,24 +556,24 @@ Definition:
 }
 ```
 
-**`.m.rule.room.server_acl`**
-
-{{% added-in v="1.4" %}}
+**<a name="mruletombstone"></a>`.m.rule.tombstone`**
 
-Suppresses notifications for [`m.room.server_acl`](#mroomserver_acl) events.
+Matches any state event whose type is `m.room.tombstone`. This is
+intended to notify users of a room when it is upgraded, similar to what
+an `@room` notification would accomplish.
 
 Definition:
 
 ```json
 {
-    "rule_id": ".m.rule.room.server_acl",
+    "rule_id": ".m.rule.tombstone",
     "default": true,
     "enabled": true,
     "conditions": [
         {
             "kind": "event_match",
             "key": "type",
-            "pattern": "m.room.server_acl"
+            "pattern": "m.room.tombstone"
         },
         {
             "kind": "event_match",
@@ -583,39 +581,41 @@ Definition:
             "pattern": ""
         }
     ],
-    "actions": []
+    "actions": [
+        "notify",
+        {
+            "set_tweak": "highlight"
+        }
+    ]
 }
 ```
 
-**`.m.rule.roomnotif`**
+**`.m.rule.room.server_acl`**
 
-Matches any message whose content is unencrypted and contains the text
-`@room`, signifying the whole room should be notified of the event.
+{{% added-in v="1.4" %}}
+
+Suppresses notifications for [`m.room.server_acl`](#mroomserver_acl) events.
 
 Definition:
 
 ```json
 {
-    "rule_id": ".m.rule.roomnotif",
+    "rule_id": ".m.rule.room.server_acl",
     "default": true,
     "enabled": true,
     "conditions": [
         {
             "kind": "event_match",
-            "key": "content.body",
-            "pattern": "@room"
+            "key": "type",
+            "pattern": "m.room.server_acl"
         },
         {
-            "kind": "sender_notification_permission",
-            "key": "room"
+            "kind": "event_match",
+            "key": "state_key",
+            "pattern": ""
         }
     ],
-    "actions": [
-        "notify",
-        {
-            "set_tweak": "highlight"
-        }
-    ]
+    "actions": []
 }
 ```