GroupedOpenApi: replace array parameter with vararg

[Aloren]

This change is backward compatible, but allows more convenient usage of GroupedOpenApi api.
Instead of:

	String paths[] = {"/store/**", "/admin/**"};
	return GroupedOpenApi.builder()
                   .setGroup("stores")
                   .pathsToMatch(paths)
		  .build();

now you can use:

	return GroupedOpenApi.builder()
                   .setGroup("stores")
                   .pathsToMatch("/store/**", "/admin/**")
		  .build();

[springdoc]

Thank you @Aloren for your contribution!