docs: Fix types and missing property in WebRequest APIs (#17046)

* docs: Fixed hook methods of WebRequest accepts null as listener

* docs: Added missing `referrer` property in OnBeforeRequestDetails

* docs: Add `referrer` to each webRequest responses

docs/api/web-request.md

@@ -52,6 +52,7 @@ The following methods are available on instances of `WebRequest`:
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `uploadData` [UploadData[]](structures/upload-data.md)
   * `callback` Function
@@ -79,6 +80,7 @@ The `callback` has to be called with an `response` object.
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `requestHeaders` Object
   * `callback` Function
@@ -105,6 +107,7 @@ The `callback` has to be called with an `response` object.
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `requestHeaders` Object
 
@@ -124,6 +127,7 @@ response are visible by the time this listener is fired.
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `statusLine` String
     * `statusCode` Integer
@@ -154,6 +158,7 @@ The `callback` has to be called with an `response` object.
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `responseHeaders` Object
     * `fromCache` Boolean - Indicates whether the response was fetched from disk
@@ -177,6 +182,7 @@ and response headers are available.
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `redirectURL` String
     * `statusCode` Integer
@@ -222,6 +228,7 @@ completed.
     * `method` String
     * `webContentsId` Integer (optional)
     * `resourceType` String
+    * `referrer` String
     * `timestamp` Double
     * `fromCache` Boolean
     * `error` String - The error description.