Update set-head ssh command documentation

Update documentation of 'set-head' ssh command to match current
implementation.

Change-Id: I8dfdcb1203f2430a53130f78c0134bf0f617e6f8
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
diff --git a/Documentation/cmd-set-head.txt b/Documentation/cmd-set-head.txt
index 164035e..d74caaa 100644
--- a/Documentation/cmd-set-head.txt
+++ b/Documentation/cmd-set-head.txt
@@ -5,8 +5,7 @@
 
 == SYNOPSIS
 --
-'ssh' -p <port> <host> 'gerrit set-head'
-  --project <NAME> | -p <NAME>
+'ssh' -p <port> <host> 'gerrit set-head' <NAME>
   --new-head <REF>
 --
 
@@ -23,7 +22,7 @@
 This command is intended to be used in scripts.
 
 == OPTIONS
-<PROJECT_NAME>::
+<NAME>::
     Required; name of the project to change the HEAD. If name ends
     with `.git` the suffix will be automatically removed.