Fix typo

The word “client” in this section wasn’t plural like in the other sections.

authorization_services/topics/service-authorization-obtaining-permission-authentication.adoc

@@ -24,7 +24,7 @@ the resources and scopes to which User A has access.
 
 * *Client Credentials*
 +
-Client can use any of the client authentication methods supported by {project_name}. For instance, client_id/client_secret or JWT.
+Clients can use any of the client authentication methods supported by {project_name}. For instance, client_id/client_secret or JWT.
 +
 .Example: an authorization request using client id and client secret to authenticate to the token endpoint
 ```bash
@@ -32,4 +32,4 @@ curl -X POST \
   http://${host}:${port}/auth/realms/${realm}/protocol/openid-connect/token \
   -H "Authorization: Basic cGhvdGg6L7Jl13RmfWgtkk==pOnNlY3JldA==" \
   --data "grant_type=urn:ietf:params:oauth:grant-type:uma-ticket"
-```
+```