Omit comment for now

Let's omit this comment, as we're still working through the ideal behavior of the methods in this category, and we can document this at the end of the process.

source/MaterialXCore/Document.h

@@ -362,8 +362,6 @@ class MX_CORE_API Document : public GraphElement
  }
 
  /// Return a vector of all NodeDef elements that match the given node name.
- /// Nodedefs are first searched in the registered data library. 
- /// If the registered data library search returns empty, the current document is searched.
  vector<NodeDefPtr> getMatchingNodeDefs(const string& nodeName) const;
 
  /// @}