Modify account command: Add option to clear HTTP password

Change-Id: I00033fa5987bbf58d12e4d9b357367b5d2f28770

Documentation/cmd-set-account.txt

diff --git a/Documentation/cmd-set-account.txt b/Documentation/cmd-set-account.txt
index a2944dd..9d6f8bc 100644
--- a/Documentation/cmd-set-account.txt
+++ b/Documentation/cmd-set-account.txt
@@ -9,7 +9,8 @@
             [--add-email <EMAIL>] [--delete-email <EMAIL> | ALL] \
             [--add-ssh-key - | <KEY>] \
             [--delete-ssh-key - | <KEY> | ALL] \
-            [--http-password <PASSWORD>] <USER>
+            [--http-password <PASSWORD>] \
+            [--clear-http-password] <USER>
 --
 
 == DESCRIPTION
@@ -25,9 +26,9 @@
 or have been granted
 link:access-control.html#capability_modifyAccount[the 'Modify Account' global capability].
 
-To set the HTTP password for the user account (option --http-password) the
-caller must be a member of the privileged 'Administrators' group,
-or have been granted
+To set the HTTP password for the user account (option --http-password) or
+to clear the HTTP password (option --clear-http-password) caller must be
+a member of the privileged 'Administrators' group, or have been granted
 link:access-control.html#capability_generateHttpPassword[the 'Generate HTTP Password' global capability]
 in addition to 'Modify Account' global capability.
 
@@ -85,6 +86,9 @@
 --http-password::
     Set the HTTP password for the user account.
 
+--clear-http-password::
+    Clear the HTTP password for the user account.
+
 == EXAMPLES
 Add an email and SSH key to `watcher`'s account: