Update support statuses for storage.setAccessLevel (#29536)

* Update support statuses for storage.setAccessLevel

* Apply suggestion from @rebloor

---------

Co-authored-by: rebloor <git@sherpa.co.nz>

Author: Rob--W

webextensions/api/storage.json

@@ -322,11 +322,15 @@
               "support": {
                 "chrome": {
                   "version_added": "96",
-                  "notes": "Only supported for the session storage area."
+                  "notes": [
+                    "Supported by the `session` storage area from Chrome 96.",
+                    "Supported by all storage areas from Chrome 140."
+                  ]
                 },
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": false
+                  "version_added": false,
+                  "impl_url": "https://bugzil.la/1724754"
                 },
                 "firefox_android": "mirror",
                 "opera": "mirror",