wiki: minor update to Gomote page

Add note indicating that not all builder types support `gomote ssh`.

Change-Id: I89b91d580d4a2fadf71ea9130fe84a872f078618
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/551735
Reviewed-by: Than McIntosh <thanm@google.com>
diff --git a/Gomote.md b/Gomote.md
index 09d965a..c9e8270 100644
--- a/Gomote.md
+++ b/Gomote.md
@@ -229,4 +229,4 @@
 
 ### gomote ssh
 
-The `gomote ssh` command uses a SSH keys created specifically for gomote. On the first use of the `gomote ssh` a set of keys will be created and stored in the local user configuration directory. You may be asked to add set a password for the keys (a password is not required). The SSH functionality operates with OpenSSH certificate authentication and does not require any additional configuration.
+The `gomote ssh` command uses a SSH keys created specifically for gomote. On the first use of the `gomote ssh` a set of keys will be created and stored in the local user configuration directory. You may be asked to add set a password for the keys (a password is not required). The SSH functionality operates with OpenSSH certificate authentication and does not require any additional configuration. Not all builder types support `gomote ssh`.