Apply suggestions from code review

Co-authored-by: Enrique Encalada <[email protected]>

Author: otaviof

pkg/validate/trigger.go

@@ -96,7 +96,7 @@ func (t *Trigger) validate(triggerWhen []build.TriggerWhen) []error {
 		default:
 			t.build.Status.Reason = build.BuildReasonPtr(build.TriggersInvalidType)
 			t.build.Status.Message = pointer.String(
-				fmt.Sprintf("%q contains a invalid type %q", when.Name, when.Type))
+				fmt.Sprintf("%q contains an invalid type %q", when.Name, when.Type))
 			allErrs = append(allErrs, fmt.Errorf("%s", *t.build.Status.Message))
 		}
 	}

pkg/validate/validate.go

@@ -123,7 +123,7 @@ func BuildRunFields(buildRun *build.BuildRun) (string, string) {
 
 		if buildRun.Spec.BuildSpec.Trigger != nil {
 			return resources.BuildRunBuildFieldOverrideForbidden,
-				"cannot use 'triggers' override in the 'BuildRun', it allowed in the 'Build'"
+				"cannot use 'triggers' override in the 'BuildRun', only allowed in the 'Build'"
 		}
 	}