message: fix formatting in graphql example
diff: # Example GraphQL queries
  ## Add New Client and Project
  +```
  mutation {
  # The customer of the project. Can be used for an actual customer (if you use Lagoon in a multi-customer setup),
  # or just to group multiple projects together. `customer` will hold the SSH Private Key that Lagoon will use to clone
  @@ -35,3 +36,4 @@ mutation {
  pullrequests
  }
  }
  +```
  