docs: Add configuration example for `simple-completion-language-server` (#37566)

Marshall Bowers created 

This PR adds a configuration example for the
`simple-completion-language-server`.

We show the user how to re-enable the `feature_paths` option, as we're
now disabling it by default
(https://github.com/zed-industries/zed/pull/37565).

Release Notes:

- N/A

Change summary

docs/src/snippets.md | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

Detailed changes

docs/src/snippets.md 🔗 

@@ -40,4 +40,20 @@ To create JSX snippets you have to use `javascript.json` snippets file, instead
 
 ## See also
 
+The `feature_paths` option in `simple-completion-language-server` is disabled by default.
+
+If you want to enable it you can add the following to your `settings.json`:
+
+```json
+{
+  "lsp": {
+    "snippet-completion-server": {
+      "settings": {
+        "feature_paths": true
+      }
+    }
+  }
+}
+```
+
 For more configuration information, see the [`simple-completion-language-server` instructions](https://github.com/zed-industries/simple-completion-language-server/tree/main).