docs: chrome-command-line-switches.md: update proxy-server support (#14198)

* docs: chrome-command-line-switches.md: update proxy-server support

Per issue #12443, the proxy URL in proxy-server switch would not
support username and password authentication.

* docs: security.md: correct checklist #14 markdown

When running "npm run lint:docs" script, linting warning suggests
"Broken links: #13-disable-or-limit-creation-of-new-windows". Update
accordingly to #14.

docs/api/chrome-command-line-switches.md

@@ -60,7 +60,8 @@ See the [Node documentation][node-cli] or run `node --help` in your terminal for
 Use a specified proxy server, which overrides the system setting. This switch
 only affects requests with HTTP protocol, including HTTPS and WebSocket
 requests. It is also noteworthy that not all proxy servers support HTTPS and
-WebSocket requests.
+WebSocket requests. The proxy URL does not support username and password
+authentication [per Chromium issue](https://bugs.chromium.org/p/chromium/issues/detail?id=615947).
 
 ## --proxy-bypass-list=`hosts`
 

docs/tutorial/security.md

@@ -82,7 +82,7 @@ improve the security of your application.
 11. [`<webview>`: Do not use `allowpopups`](#11-do-not-use-allowpopups)
 12. [`<webview>`: Verify options and params](#12-verify-webview-options-before-creation)
 13. [Disable or limit navigation](#13-disable-or-limit-navigation)
-14. [Disable or limit creation of new windows](#13-disable-or-limit-creation-of-new-windows)
+14. [Disable or limit creation of new windows](#14-disable-or-limit-creation-of-new-windows)
 
 ## 1) Only Load Secure Content