Add a comment explaining what selectrepos() returns.

In particular this is useful for understanding what paths
it returns, and that they have a trailing slash.
(cherry picked from commit 3d6acc19e4d029657f72bbf7200a48b5438a643a)

diff --git a/mr b/mr
index 956dd7d9bf7f247751168115a6f54ac775edd840..3a168d10e40877cc20b21ac6112005f789710959 100755 (executable)
--- a/mr
+++ b/mr
@@ -946,7 +946,10 @@ sub repodir {
        return $ret;
 }
 
-# figure out which repos to act on
+# Figure out which repos to act on.  Returns a list of array refs
+# in the format:
+#
+#   [ "$full_repo_path/", "$mr_config_path/", $section_header ]
 sub selectrepos {
        my @repos;
        foreach my $repo (repolist()) {