help: removing trailing spaces

mercurial/help/config.txt

@@ -604,9 +604,9 b' variables it is passed are listed with n'
 ``post-<command>``
   Run after successful invocations of the associated command. The
   contents of the command line are passed as ``$HG_ARGS`` and the result
-  code in ``$HG_RESULT``. Parsed command line arguments are passed as 
+  code in ``$HG_RESULT``. Parsed command line arguments are passed as
   ``$HG_PATS`` and ``$HG_OPTS``. These contain string representations of
-  the python data internally passed to <command>. ``$HG_OPTS`` is a 
+  the python data internally passed to <command>. ``$HG_OPTS`` is a
   dictionary of options (with unspecified options set to their defaults).
   ``$HG_PATS`` is a list of arguments. Hook failure is ignored.
 
@@ -616,7 +616,7 b' variables it is passed are listed with n'
   are passed as ``$HG_PATS`` and ``$HG_OPTS``. These contain string
   representations of the data internally passed to <command>. ``$HG_OPTS``
   is a  dictionary of options (with unspecified options set to their
-  defaults). ``$HG_PATS`` is a list of arguments. If the hook returns 
+  defaults). ``$HG_PATS`` is a list of arguments. If the hook returns
   failure, the command doesn't execute and Mercurial returns the failure
   code.