Update method-patterns.md

[CodexRaunak]

Update the ChangeMethodNameVisitor class.

What's changed?

• The getType() returns a JavaType, changed it to getMethodType().
• With withType() we have to mention the withMethodType() as well or it will give the error of missing type or invalid type error.

What's your motivation?

I was making a recipe to change the method name, when I refered docs I used the code provided in the ChangeMethodNameVisitor but it errored to missing type or invalid type in LST. Then I made the required changes, maybe this was the correct one used before. But now the current change works.

I reffered this https://github.com/openrewrite/rewrite/blob/main/rewrite-java/src/main/java/org/openrewrite/java/ChangeMethodName.java#L103-L110

Before:

JavaType.Method type = m.getType();
            if (type != null) {
                type = type.withName(newMethodName);
            }

            m = m.withName(m.getName().withName(newMethodName))
                    .withType(type);
        }

Or also change made in 2 cycles error.

After:
No error, recipe works fine.

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[mike-solomon]

Thanks so much for catching and fixing this!