FF152 MediaCapabilities - fetch-style nesting with _option for enum values

Use fetch API convention: configuration_parameter as parent, sub-properties
as plain names with "property" descriptions nested inside it, and _option
suffix for enum values of the type property.

Author: hamishwillee

api/MediaCapabilities.json

@@ -114,9 +114,9 @@
               "deprecated": false
             }
           },
-          "keySystemConfiguration_parameter": {
+          "keySystemConfiguration": {
             "__compat": {
-              "description": "`configuration.keySystemConfiguration` parameter",
+              "description": "`keySystemConfiguration` property",
               "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/decodingInfo#keysystemconfiguration",
               "spec_url": "https://w3c.github.io/media-capabilities/#dom-mediadecodingconfiguration-keysystemconfiguration",
               "tags": [
@@ -150,9 +150,9 @@
               }
             }
           },
-          "type_parameter": {
+          "type": {
             "__compat": {
-              "description": "`configuration.type` parameter",
+              "description": "`type` property",
               "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/decodingInfo#type",
               "spec_url": "https://w3c.github.io/media-capabilities/#dom-mediadecodingconfiguration-type",
               "support": {
@@ -186,7 +186,7 @@
             },
             "webrtc_option": {
               "__compat": {
-                "description": "`configuration.type.webrtc` parameter",
+                "description": "`configuration.type.webrtc` option",
                 "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/decodingInfo#webrtc",
                 "spec_url": "https://w3c.github.io/media-capabilities/#dom-mediadecodingtype-webrtc",
                 "support": {
@@ -297,9 +297,9 @@
               "deprecated": false
             }
           },
-          "type_parameter": {
+          "type": {
             "__compat": {
-              "description": "`configuration.type` parameter",
+              "description": "`type` property",
               "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/encodingInfo#type",
               "spec_url": "https://w3c.github.io/media-capabilities/#dom-mediaencodingconfiguration-type",
               "tags": [
@@ -334,7 +334,7 @@
             },
             "transmission_option": {
               "__compat": {
-                "description": "`configuration.type.transmission` parameter",
+                "description": "`configuration.type.transmission` option",
                 "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/encodingInfo#transmission",
                 "tags": [
                   "web-features:media-capabilities"
@@ -371,7 +371,7 @@
             },
             "webrtc_option": {
               "__compat": {
-                "description": "`configuration.type.webrtc` parameter",
+                "description": "`configuration.type.webrtc` option",
                 "mdn_url": "https://developer.mozilla.org/docs/Web/API/MediaCapabilities/encodingInfo#webrtc",
                 "spec_url": "https://w3c.github.io/media-capabilities/#dom-mediaencodingtype-webrtc",
                 "tags": [