Fix heading level for Required Arguments validation rule

goto-bus-stop · goto-bus-stop · commit 901c4a998d59 · 2023-11-09T13:53:33.000+01:00
Currently in the rendered spec, Required Arguments shows up as a
sub-rule of "Argument Uniqueness". It's an independent rule so it should
show up next to it instead.
diff --git a/spec/Section 5 -- Validation.md b/spec/Section 5 -- Validation.md
@@ -739,7 +739,7 @@ invalid.
     which contains {argument}.
   - {arguments} must be the set containing only {argument}.
 
-#### Required Arguments
+### Required Arguments
 
 - For each Field or Directive in the document:
   - Let {arguments} be the arguments provided by the Field or Directive.
