Fix pip package description (#21064)

Author: bartekkuncer

tools/pip/setup.py

@@ -141,7 +141,7 @@ def skip_markdown_comments(md):
 
 from mxnet.runtime import Features
 if Features().is_enabled("ONEDNN"):
-    libraries.append('ONEDNN')
+    libraries.append('oneDNN')
 
 short_description += ' This version uses {0}.'.format(' and '.join(libraries))