Make Swift 6 generator stable

Author: 4brunu

docs/generators.md

@@ -67,7 +67,7 @@ The following generators are available:
 * [scalaz](generators/scalaz.md)  
 * [swift-combine](generators/swift-combine.md)  
 * [swift5](generators/swift5.md)  
-* [swift6 (beta)](generators/swift6.md)  
+* [swift6](generators/swift6.md)  
 * [typescript (experimental)](generators/typescript.md)  
 * [typescript-angular](generators/typescript-angular.md)  
 * [typescript-aurelia](generators/typescript-aurelia.md)