Don't require conversion

Author: di

source/specifications/core-metadata.rst

@@ -801,8 +801,7 @@ Deprecated Fields
 .. _core-metadata-home-page:
 
 Deprecated fields are valid metadata fields for any metadata version. Tools
-MUST attempt to convert deprecated fields to non-deprecated fields when
-appropriate. Tools SHOULD warn users when deprecated fields are used.
+SHOULD warn users when deprecated fields are used.
 
 Home-page
 ---------