[KETO] Introspect url is wrong in "help" command

Other Open Source
#1

In help command instrospect url is “hydra-url/oauth2/introspection”, but introspect on hydra work at “hydra-url/oauth2/introspect”

“Example: AUTHENTICATOR_OAUTH2_INTROSPECTION_INTROSPECTION_URL=https://my-server/oauth2/introspection”