capabilities: clarify that TOML supports schema (#3213)

Author: WofWca

src/content/docs/security/capabilities.mdx

@@ -217,8 +217,9 @@ to higher privileged windows.
 
 Tauri generates JSON schemas with all the permissions available to
 your application, allowing autocompletion in your IDE.
-To use a schema, set the `$schema` property in your configuration to one of the
-platform-specific schemas located in the `gen/schemas` directory. Usually
+To use a schema, set the `$schema` property in your configuration file
+(either .json or .toml) to one of the platform-specific schemas
+located in the `gen/schemas` directory. Usually
 you will set it to `../gen/schemas/desktop-schema.json` or
 `../gen/schemas/mobile-schema.json` though you can also define a capability
 for a specific target platform.