Merge branch 'jc/doc-diff-filter-exclude' into maint

Belated doc update for a feature added in v1.8.5.

* jc/doc-diff-filter-exclude:
diff: document diff-filter exclusion

diff --combined Documentation/diff-options.txt
index d9ae681d8ff676a80e757adb76b02787a5c091c7,073c7e58f4eb8dce2516eb236421030169704c2e..705a8739420067d433817c0f855c5cb4ee99559b
--- 1/Documentation/diff-options.txt
--- 2/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@@ -26,12 -26,12 +26,12 @@@ ifndef::git-format-patch[
  ifdef::git-diff[]
        This is the default.
  endif::git-diff[]
 -endif::git-format-patch[]
  
  -s::
  --no-patch::
        Suppress diff output. Useful for commands like `git show` that
        show the patch by default, or to cancel the effect of `--patch`.
 +endif::git-format-patch[]
  
  -U<n>::
  --unified=<n>::
@@@ -63,13 -63,6 +63,13 @@@ ifndef::git-format-patch[
        Synonym for `-p --raw`.
  endif::git-format-patch[]
  
 +--compaction-heuristic::
 +--no-compaction-heuristic::
 +      These are to help debugging and tuning an experimental
 +      heuristic (which is off by default) that shifts the hunk
 +      boundary in an attempt to make the resulting patch easier
 +      to read.
 +
  --minimal::
        Spend extra time to make sure the smallest possible
        diff is produced.
@@@ -274,11 -267,8 +274,11 @@@ expression to make sure that it matche
  A match that contains a newline is silently truncated(!) at the
  newline.
  +
 +For example, `--word-diff-regex=.` will treat each character as a word
 +and, correspondingly, show differences character by character.
 ++
  The regex can also be set via a diff driver or configuration option, see
 -linkgit:gitattributes[1] or linkgit:git-config[1].  Giving it explicitly
 +linkgit:gitattributes[5] or linkgit:git-config[1].  Giving it explicitly
  overrides any diff driver or configuration setting.  Diff drivers
  override configuration settings.
  
@@@ -293,24 -283,14 +293,24 @@@ endif::git-format-patch[
  
  ifndef::git-format-patch[]
  --check::
 -      Warn if changes introduce whitespace errors.  What are
 -      considered whitespace errors is controlled by `core.whitespace`
 +      Warn if changes introduce conflict markers or whitespace errors.
 +      What are considered whitespace errors is controlled by `core.whitespace`
        configuration.  By default, trailing whitespaces (including
        lines that solely consist of whitespaces) and a space character
        that is immediately followed by a tab character inside the
        initial indent of the line are considered whitespace errors.
        Exits with non-zero status if problems are found. Not compatible
        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`.
 +
  endif::git-format-patch[]
  
  --full-index::
@@@ -419,6 -399,9 +419,9 @@@ ifndef::git-format-patch[
        paths are selected if there is any file that matches
        other criteria in the comparison; if there is no file
        that matches other criteria, nothing is selected.
+ +
+ Also, these upper-case letters can be downcased to exclude.  E.g.
+ `--diff-filter=ad` excludes added and deleted paths.
  
  -S<string>::
        Look for differences that change the number of occurrences of