[Fix] upload schema example (#144)

* Remove grant_type form field from upload schema

Form field grant_type missing opening quotes. With correct quoting Baas
throws error - Unexpected Name \"grant_type\".

* Treat data as a filename in upload schema example

Curl --data-binary filename needs to start with '@' so it is read as a
file.

---------

Co-authored-by: Anthony Menasse <anthony.menasse@rhize.com>

content/deploy/install/services.md

@@ -114,9 +114,8 @@ If enabling the Audit Trail, also the include the configuration in [Enable chang
     ```bash
     curl --location --request POST 'http://localhost:<FORWARDED_PORT>/admin/schema' \
     --header 'Authorization: Bearer <TOKEN>' \
-    --data grant_type=urn:ietf:params:oauth:grant-type:uma-ticket" \
     --header 'Content-Type: application/octet-stream' \
-    --data-binary '<SCHEMA_FILE>’
+    --data-binary '@<SCHEMA_FILE>’
     ```
 
     This creates more roles.