Documentation: trivial grammar fix in core.worktree description

Signed-off-by: SZEDER Gábor <szeder@ira.uka.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 52ffbf4..6babbc7 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -320,7 +320,7 @@
 	Set the path to the root of the working tree.
 	This can be overridden by the GIT_WORK_TREE environment
 	variable and the '--work-tree' command line option.
-	The value can an absolute path or relative to the path to
+	The value can be an absolute path or relative to the path to
 	the .git directory, which is either specified by --git-dir
 	or GIT_DIR, or automatically discovered.
 	If --git-dir or GIT_DIR is specified but none of