builtin-branch: remove duplicated code

diff --git a/Documentation/config.txt b/Documentation/config.txt
index e7848055a90c38f48ad7180cb538d0b00e482710..1a13abc92223090c563a19074a29b703758d5286 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -92,7 +92,7 @@ Example
 
        # Our diff algorithm
        [diff]
-               external = "/usr/local/bin/gnu-diff -u"
+               external = /usr/local/bin/diff-wrapper
                renames = true
 
        [branch "devel"]
@@ -358,7 +358,8 @@ core.whitespace::
        A comma separated list of common whitespace problems to
        notice.  'git-diff' will use `color.diff.whitespace` to
        highlight them, and 'git-apply --whitespace=error' will
-       consider them as errors:
+       consider them as errors.  You can prefix `-` to disable
+       any of them (e.g. `-trailing-space`):
 +
 * `trailing-space` treats trailing whitespaces at the end of the line
   as an error (enabled by default).
@@ -562,9 +563,11 @@ diff.autorefreshindex::
 diff.external::
        If this config variable is set, diff generation is not
        performed using the internal diff machinery, but using the
-       given command.  Note: if you want to use an external diff
-       program only on a subset of your files, you might want to
-       use linkgit:gitattributes[5] instead.
+       given command.  Can be overridden with the `GIT_EXTERNAL_DIFF'
+       environment variable.  The command is called with parameters
+       as described under "git Diffs" in linkgit:git[1].  Note: if
+       you want to use an external diff program only on a subset of
+       your files, you might want to use linkgit:gitattributes[5] instead.
 
 diff.renameLimit::
        The number of files to consider when performing the copy/rename