short uuid added (#312)

variables.mdx

@@ -10,7 +10,8 @@ You can use them when manually editing a step or in the prompt when creating new
 - `$OCTO_USERNAME`: The username you configured for use with your page in the sign up flow or the settings
 - `$OCTO_PASSWORD`: The password you configured for use with your page in the sign up flow or in the settings
 - `$OCTO_URL`: The URL of your page
-- `$OCTO_STABLE_UUID`: A random combination of letters and numbers that will be consistent through multiple references across a single run, but different if you run the agent again
+- `$OCTO_STABLE_UUID`: A random combination of letters and numbers that will be consistent through multiple references across a single run, but different if you run the agent again - full uuid of 36 characters
+- `$OCTO_STABLE_UUID_SHORT`: A random combination of letters and numbers that will be consistent through multiple references across a single run, but different if you run the agent again - maximum length of 8 characters.
 - `$OCTO_TOTP`: 2-Factor authentication code if you require if for the login. Find out more about [2-FA enrollment](./2fa)
 
 Let us know if you what other variables are of high priority for you.