documentation: add tutorial for first contribution

diff --git a/Documentation/git-gc.txt b/Documentation/git-gc.txt
index a7442499f6d3985fa2ca57fa827d454b11479705..a7c1b0f60edb6ccd38ddb3ea4624fe0d213820b4 100644 (file)
--- a/Documentation/git-gc.txt
+++ b/Documentation/git-gc.txt
@@ -76,7 +76,7 @@ be performed as well.
 --prune=<date>::
        Prune loose objects older than date (default is 2 weeks ago,
        overridable by the config variable `gc.pruneExpire`).
-       --prune=all prunes loose objects regardless of their age and
+       --prune=now prunes loose objects regardless of their age and
        increases the risk of corruption if another process is writing to
        the repository concurrently; see "NOTES" below. --prune is on by
        default.