cgitrc.5.txt: document repo.scan and cache-scanrc-ttl

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgitrc.5.txt

@@ -54,6 +54,10 @@ cache-root-ttl::
 	Number which specifies the time-to-live, in minutes, for the cached
 	version of the repository index page. Default value: "5".
 
+cache-scanrc-ttl::
+	Number which specifies the time-to-live, in minutes, for the result
+	of scanning a path for git repositories. Default value: "15".
+
 cache-size::
 	The maximum number of entries in the cgit cache. Default value: "0"
 	(i.e. caching is disabled).
@@ -199,6 +203,11 @@ repo.group::
 	A value for the current repository group, which all repositories
 	specified after this setting will inherit. Default value: none.
 
+repo.scan::
+	A path which will be scanned for repositories. If caching is enabled,
+	the result will be cached as a cgitrc include-file in the cache
+	directory. Default value: none. See also: cache-scanrc-ttl.
+
 robots::
 	Text used as content for the "robots" meta-tag. Default value:
 	"index, nofollow".