Gerrit command line utility to set/update secure.config

When using a secure store for encrypting the secure.config
values, an utility or tool is needed to edit the values
using the same encryption key used by Gerrit at runtime.

Change-Id: Iacb017b010f7efd8217255796e571c5291499c0e
diff --git a/Documentation/pgm-index.txt b/Documentation/pgm-index.txt
index bf6dc57..0c347f4 100644
--- a/Documentation/pgm-index.txt
+++ b/Documentation/pgm-index.txt
@@ -33,6 +33,9 @@
 version::
 	Display the release version of Gerrit Code Review.
 
+link:pgm-passwd.html[passwd]::
+	Set or reset password in secure.config.
+
 === Transition Utilities
 
 link:pgm-LocalUsernamesToLowerCase.html[LocalUsernamesToLowerCase]::