doc: add parameters for settings events

Add parameters for the callback for the Http2Session:localSettings event
and Http2Session:remoteSettings event inline with the pattern in the
rest of the documentation.

Refs: nodejs/help#877 (comment)

PR-URL: #20371
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

doc/api/http2.md

@@ -195,9 +195,10 @@ event is emitted.
 added: v8.4.0
 -->
 
+* `settings` {HTTP/2 Settings Object} A copy of the `SETTINGS` frame received.
+
 The `'localSettings'` event is emitted when an acknowledgment `SETTINGS` frame
-has been received. When invoked, the handler function will receive a copy of
-the local settings.
+has been received.
 
 When using `http2session.settings()` to submit new settings, the modified
 settings do not take effect until the `'localSettings'` event is emitted.
@@ -215,9 +216,10 @@ session.on('localSettings', (settings) => {
 added: v8.4.0
 -->
 
+* `settings` {HTTP/2 Settings Object} A copy of the `SETTINGS` frame received.
+
 The `'remoteSettings'` event is emitted when a new `SETTINGS` frame is received
-from the connected peer. When invoked, the handler function will receive a copy
-of the remote settings.
+from the connected peer.
 
 ```js
 session.on('remoteSettings', (settings) => {