doc: improve localWindowSize event descriptions

The documentation listed the wrong event to subscribe to when calling
`localWindowSize`. Also properly point out the correct event for http2
clients.

Fixes: #51014
Refs: #38426
PR-URL: #51071
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/http2.md

@@ -611,13 +611,15 @@ const http2 = require('node:http2');
 
 const server = http2.createServer();
 const expectedWindowSize = 2 ** 20;
-server.on('connect', (session) => {
+server.on('session', (session) => {
 
   // Set local window size to be 2 ** 20
   session.setLocalWindowSize(expectedWindowSize);
 });
 ```
 
+For http2 clients the proper event is either `'connect'` or `'remoteSettings'`.
+
 #### `http2session.setTimeout(msecs, callback)`
 
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