Merge pull request #9173 from pwaller/patch-1

Clarify display_html docs in case of no HTML repr

IPython/core/display.py

@@ -185,6 +185,9 b' def display_pretty(*objs, **kwargs):'
 
 def display_html(*objs, **kwargs):
     """Display the HTML representation of an object.
+    
+    Note: If raw=False and the object does not have a HTML
+    representation, no HTML will be shown.
 
     Parameters
     ----------