Re-add deleted comment in default.json (#48279)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

assets/settings/default.json

@@ -2356,6 +2356,7 @@
   "line_indicator_format": "long",
   // Set a proxy to use. The proxy protocol is specified by the URI scheme.
   //
+  // Supported URI scheme: `http`, `https`, `socks4`, `socks4a`, `socks5`,
   // `socks5h`. `http` will be used when no scheme is specified.
   //
   // By default no proxy will be used, or Zed will try get proxy settings from