fix error_message typo

Author: AdarshK15

community/modules/scheduler/schedmd-slurm-gcp-v6-controller/metadata.yaml

@@ -31,4 +31,4 @@ ghpc:
     inputs:
       vars: [slurm_cluster_name]
       pattern: "^[a-z](?:[a-z0-9]{0,9})$"
-    error_message: "'slurm_cluster_name' must contain abc only lowercase letters and numbers, start with a letter, and be 1-10 characters long."
+    error_message: "'slurm_cluster_name' must contain only lowercase letters and numbers, start with a letter, and be 1-10 characters long."