[PATCH 2/3] shortlog: add usage-string for stdin-reading

[Martin Ågren <martin.agren@gmail.com>]

This has been missing since we learned to print usage, way back in
4e27fb06f (add commit count options to git-shortlog, 2006-10-06).

While at it, drop the [] around "<path>...". This matches `git log -h`
and Documentation/git-{short}log.txt. It formally makes it look like we
do not allow `git shortlog --`, but we gain readability and consistency.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 builtin/shortlog.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/builtin/shortlog.c b/builtin/shortlog.c
index e29875b84..dc4af03fc 100644
--- a/builtin/shortlog.c
+++ b/builtin/shortlog.c
@@ -11,7 +11,8 @@
 #include "parse-options.h"
 
 static char const * const shortlog_usage[] = {
-	N_("git shortlog [<options>] [<revision-range>] [[--] [<path>...]]"),
+	N_("git shortlog [<options>] [<revision-range>] [[--] <path>...]"),
+	N_("git log --pretty=short | git shortlog [<options>]"),
 	NULL
 };
 
-- 
2.16.2.246.ga4ee44448f