Backport PR #10269 on branch 5.x

Fix docstring of FileLink to match parameter name

IPython/lib/display.py

@@ -324,11 +324,11 b' class FileLink(object):'
         ----------
         path : str
             path to the file or directory that should be formatted
-        directory_prefix : str
+        url_prefix : str
             prefix to be prepended to all files to form a working link [default:
-            'files']
+            '']
         result_html_prefix : str
-            text to append to beginning to link [default: none]
+            text to append to beginning to link [default: '']
         result_html_suffix : str
             text to append at the end of link [default: '<br>']
         """