[PATCH 3 of 3] extdiff: drop the command alias without options example in the help text

[Matt Harbison]

# HG changeset patch
# User Matt Harbison <matt_harbison at yahoo.com>
# Date 1414960035 18000
#      Sun Nov 02 15:27:15 2014 -0500
# Branch stable
# Node ID cc9048af72fa1ce250a76d60c1081d5b61962809
# Parent  c83902f33e07c7546fd2c0bf0184456265f08043
extdiff: drop the command alias without options example in the help text

In the dropped example, the extension would look for 'vdiff.diffargs' in the
configuration, and not finding it, would run kdiff3 without the configured
options.  That's not obvious to a new user who sees a kdiff3 configuration in
the prepackaged mergetools.rc file, and sees that kdiff3 still runs.  While it
is conceivable that the user wants a kdiff3 command that runs without the
preconfigured options, it is more likely what they want is this, which uses the
canned options:

    [alias]
    vdiff = kdiff3

    [extdiff]
    kdiff3 =

We could mention alias here, but that seems like it belongs elswhere.

diff --git a/hgext/extdiff.py b/hgext/extdiff.py
--- a/hgext/extdiff.py
+++ b/hgext/extdiff.py
@@ -23,9 +23,6 @@
   #cmd.cdiff = gdiff
   #opts.cdiff = -Nprc5
 
-  # add new command called vdiff, runs kdiff3
-  vdiff = kdiff3
-
   # add new command called meld, runs meld (no need to name twice).  If
   # the meld executable is not available, the meld tool in [merge-tools]
   # will be used, if available
diff --git a/tests/test-extension.t b/tests/test-extension.t
--- a/tests/test-extension.t
+++ b/tests/test-extension.t
@@ -424,9 +424,6 @@
     #cmd.cdiff = gdiff
     #opts.cdiff = -Nprc5
   
-    # add new command called vdiff, runs kdiff3
-    vdiff = kdiff3
-  
     # add new command called meld, runs meld (no need to name twice).  If
     # the meld executable is not available, the meld tool in [merge-tools]
     # will be used, if available