[PATCH v2] doc: add missing values "none" and "default" for diff.wsErrorHighlight

[Andreas Heiduk <asheiduk@gmail.com>]

The values have eluded documentation so far. While at it streamline
the wording by grouping relevant parts together.

Signed-off-by: Andreas Heiduk <asheiduk@gmail.com>
---
 Documentation/diff-config.txt  | 11 +++++++----
 Documentation/diff-options.txt | 17 ++++++++---------
 2 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/Documentation/diff-config.txt b/Documentation/diff-config.txt
index cbce8ec63..5ca942ab5 100644
--- a/Documentation/diff-config.txt
+++ b/Documentation/diff-config.txt
@@ -200,7 +200,10 @@ diff.algorithm::
 +
 
 diff.wsErrorHighlight::
-	A comma separated list of `old`, `new`, `context`, that
-	specifies how whitespace errors on lines are highlighted
-	with `color.diff.whitespace`.  Can be overridden by the
-	command line option `--ws-error-highlight=<kind>`
+	Highlight whitespace errors in the `context`, `old` or `new`
+	lines of the diff.  Multiple values are separated by comma,
+	`none` resets previous values, `default` reset the list to
+	`new` and `all` is a shorthand for `old,new,context`.  The
+	whitespace errors are colored with `color.diff.whitespace`.
+	The command line option `--ws-error-highlight=<kind>`
+	overrides this setting.
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 89cc0f48d..d60f61ad4 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -300,15 +300,14 @@ ifndef::git-format-patch[]
 	with --exit-code.
 
 --ws-error-highlight=<kind>::
-	Highlight whitespace errors on lines specified by <kind>
-	in the color specified by `color.diff.whitespace`.  <kind>
-	is a comma separated list of `old`, `new`, `context`.  When
-	this option is not given, only whitespace errors in `new`
-	lines are highlighted.  E.g. `--ws-error-highlight=new,old`
-	highlights whitespace errors on both deleted and added lines.
-	`all` can be used as a short-hand for `old,new,context`.
-	The `diff.wsErrorHighlight` configuration variable can be
-	used to specify the default behaviour.
+	Highlight whitespace errors in the `context`, `old` or `new`
+	lines of the diff.  Multiple values are separated by comma,
+	`none` resets previous values, `default` reset the list to
+	`new` and `all` is a shorthand for `old,new,context`.  When
+	this option is not given, and the configuration variable
+	`diff.wsErrorHighlight` is not set, only whitespace errors in
+	`new` lines are highlighted. The whitespace errors are colored
+	whith `color.diff.whitespace`.
 
 endif::git-format-patch[]
 
-- 
2.13.3