Formatting tweak. [ci skip]

Author: lohedges

doc/source/tutorials/molecular_editing.rst

@@ -109,7 +109,7 @@ SireMol::AtomCharges( size=9
 .. Note::
    To see the full list of properties available for a molecule, you can use the
    ``propertyKeys()`` method on the underlying Sire molecule object, e.g.
-    ``ethanol._sire_object.propertyKeys()``.
+   ``ethanol._sire_object.propertyKeys()``.
 
 Editing bonds
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