Merge branch 'cr/git-work-tree-sans-git-dir'

These days, "git --work-tree=there cmd" without specifying an
explicit --git-dir=here will do the usual discovery, but we had a
description of older behaviour in the documentation.

* cr/git-work-tree-sans-git-dir:
  git.txt: remove stale comment regarding GIT_WORK_TREE

Documentation/git.txt

@@ -683,9 +683,7 @@ Git so take care if using Cogito etc.
 	The '--git-dir' command-line option also sets this value.
 
 'GIT_WORK_TREE'::
-	Set the path to the working tree.  The value will not be
-	used in combination with repositories found automatically in
-	a .git directory (i.e. $GIT_DIR is not set).
+	Set the path to the root of the working tree.
 	This can also be controlled by the '--work-tree' command line
 	option and the core.worktree configuration variable.