Minor grammar fix

Signed-off-by: Jonathan Stone <jstone@lucasfilm.com>

Author: jstone-lucasfilm

source/MaterialXGenMdl/MdlShaderGenerator.h

@@ -100,7 +100,7 @@ class MX_GENMDL_API MdlShaderGenerator : public ShaderGenerator
     /// Get the version number suffix appended to MDL modules that use versions.
     const string& getMdlVersionFilenameSuffix(GenContext& context) const;
 
-    /// Emit type definitions for all data types that needs it.
+    /// Emit type definitions for all data types that need them.
     void emitTypeDefinitions(GenContext& context, ShaderStage& stage) const override;
 
   protected: