Fix spelling of method names: find_method*

doc/Type/Metamodel/MROBasedMethodDispatch.pod6

@@ -21,7 +21,7 @@ VM-specific sentinel value (typically a low-level NULL value) that can be tested
 with a test for L<definedness|/routine/defined>:
 
     for <upper-case  uc> {
-        Str.^findmethod: $^meth andthen .("foo").say
+        Str.^find_method: $^meth andthen .("foo").say
             orelse "method `$meth` not found".say
     }
     # OUTPUT:
@@ -32,7 +32,7 @@ If C<:no_fallback> is supplied, fallback methods are not considered.
 
 =head2 method find_method_qualified
 
-    method find_method(Metamodel::MROBasedMethodDispatch:D: $obj, $type, $name)
+    method find_method_qualified(Metamodel::MROBasedMethodDispatch:D: $obj, $type, $name)
 
 Given a method name and a type, returns the method from that type. This is
 used in calls like