fix accidental typo

Co-authored-by: Chris Smowton <smowton@github.com>

Author: erik-krogh

ql/ql/src/codeql_ql/ast/internal/AstNodes.qll

@@ -233,7 +233,7 @@ module AstConsistency {
     not exists(node.getParent()) and
     not node.getLocation().getStartColumn() = 1 and // startcolumn = 1 <=> top level in file <=> fine to have no parent
     exists(node.toString()) and // <- there are a few parse errors in "global-data-flow-java-1.ql", this way we filter them out.
-    not node instanceof YAML::YAMLNode and // parents for YAML does't work
+    not node instanceof YAML::YAMLNode and // parents for YAML doesn't work
     not (node instanceof QLDoc and node.getLocation().getFile().getExtension() = "dbscheme") // qldoc in dbschemes are not hooked up
   }