Apply suggestions from code review

Co-authored-by: Hamish Willee <hamishwillee@gmail.com>

Author: hamishwillee

api/MediaCapabilities.json

@@ -183,41 +183,6 @@
                 "standard_track": true,
                 "deprecated": false
               }
-            },
-            "transmission_option": {
-              "__compat": {
-                "description": "`configuration.type.transmission` parameter",
-                "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/decodingInfo#transmission",
-                "support": {
-                  "chrome": {
-                    "version_added": "66"
-                  },
-                  "chrome_android": "mirror",
-                  "edge": "mirror",
-                  "firefox": {
-                    "version_added": "63",
-                    "partial_implementation": true,
-                    "notes": "The spec name for this option is `webrtc`."
-                  },
-                  "firefox_android": "mirror",
-                  "oculus": "mirror",
-                  "opera": "mirror",
-                  "opera_android": {
-                    "version_added": "48"
-                  },
-                  "safari": {
-                    "version_added": "13"
-                  },
-                  "safari_ios": "mirror",
-                  "samsunginternet_android": "mirror",
-                  "webview_android": "mirror",
-                  "webview_ios": "mirror"
-                },
-                "status": {
-                  "experimental": false,
-                  "standard_track": false,
-                  "deprecated": true
-                }
               }
             },
             "webrtc_option": {