Add getTransports() method of AuthenticatorAttestationResponse (#3654)

* Describing getTransports method of AuthenticatorAttestationResponse

* fixing linting errors :$

* Fixing Chrome version number

* addressing @jpmedley's comment regarding Google's position

api/AuthenticatorAttestationResponse.json

@@ -130,6 +130,57 @@
             "deprecated": false
           }
         }
+      },
+      "getTransports": {
+        "__compat": {
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/AuthenticatorAttestationResponse/getTransports",
+          "support": {
+            "chrome": {
+              "version_added": false
+            },
+            "chrome_android": {
+              "version_added": false
+            },
+            "edge": {
+              "version_added": null
+            },
+            "edge_mobile": {
+              "version_added": null
+            },
+            "firefox": {
+              "version_added": false
+            },
+            "firefox_android": {
+              "version_added": false
+            },
+            "ie": {
+              "version_added": false
+            },
+            "opera": {
+              "version_added": false
+            },
+            "opera_android": {
+              "version_added": false
+            },
+            "safari": {
+              "version_added": false
+            },
+            "safari_ios": {
+              "version_added": false
+            },
+            "samsunginternet_android": {
+              "version_added": null
+            },
+            "webview_android": {
+              "version_added": false
+            }
+          },
+          "status": {
+            "experimental": true,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
       }
     }
   }