Update namespace.py

Correct unattended to unintended in reset method docstring.

IPython/core/magics/namespace.py

@@ -492,7 +492,7 b' class NamespaceMagics(Magics):'
         --aggressive
             Try to aggressively remove modules from sys.modules ; this
             may allow you to reimport Python modules that have been updated and
-            pick up changes, but can have unattended consequences.
+            pick up changes, but can have unintended consequences.
 
         in
             reset input history