Unify the terms used

pkg/serving/config_changes.go

@@ -32,15 +32,15 @@ var UserImageAnnotationKey = "client.knative.dev/user-image"
 
 // UpdateEnvVars gives the configuration all the env var values listed in the given map of
 // vars.  Does not touch any environment variables not mentioned, but it can add
-// new env vars and change the values of existing ones, then sort by environment key name.
+// new env vars and change the values of existing ones, then sort by env key name.
 func UpdateEnvVars(template *servingv1alpha1.RevisionTemplateSpec, toUpdate map[string]string, toRemove []string) error {
 	container, err := ContainerOfRevisionTemplate(template)
 	if err != nil {
 		return err
 	}
 	updated := updateEnvVars(container.Env, toUpdate)
 	removed := removeEnvVars(updated, toRemove)
-	// Sort by Env key name
+	// Sort by env key name
 	sort.SliceStable(removed, func(i, j int) bool {
 		return removed[i].Name < removed[j].Name
 	})