[PATCH] fix a typo in the update command description

[Lele Gaifax]

"revison" -> "revision"

# HG changeset patch
# User Lele Gaifax <lele at metapensiero.it>
# Date 1325688132 -3600
# Node ID 5c572d145c16b4f8a030682bc0698324f52155ce
# Parent  371cff9610cdf6d6a7e1a6238ce75441b8107f03
fix typo in the help of the update command

diff -r 371cff9610cd -r 5c572d145c16 mercurial/commands.py
--- a/mercurial/commands.py	Tue Jan 03 17:13:03 2012 -0600
+++ b/mercurial/commands.py	Wed Jan 04 15:42:12 2012 +0100
@@ -5611,7 +5611,7 @@
     found, the working directory is updated to the specified
     changeset.

-    Update sets the working directory's parent revison to the specified
+    Update sets the working directory's parent revision to the specified
     changeset (see :hg:`help parents`).

     The following rules apply when the working directory contains

--
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele at metapensiero.it  |                 -- Fortunato Depero, 1929.