doc: fix missing "::" in config list

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 02696208c9d8f014ad148eca4874b06f9db2fcfb..86b2435667f32b1201d4d478b1d3a57385310fe1 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -2351,7 +2351,7 @@ rebase.missingCommitsCheck::
        command in the todo-list.
        Defaults to "ignore".
 
-rebase.instructionFormat
+rebase.instructionFormat::
        A format string, as specified in linkgit:git-log[1], to be used for
        the instruction list during an interactive rebase.  The format will automatically
        have the long commit hash prepended to the format.