template: fix comments and docs

Review notes from @lgfa29

Co-authored-by: Luiz Aoqui <luiz@hashicorp.com>

client/allocrunner/taskrunner/template/template_test.go

@@ -2234,7 +2234,7 @@ func TestTaskTemplateManager_writeToFile(t *testing.T) {
 	require.NoError(t, harness.startWithErr(), "couldn't setup initial harness")
 	defer harness.stop()
 
-	// Using writeToFile should cause a kill
+	// Using writeToFile should not cause a kill
 	select {
 	case <-harness.mockHooks.UnblockCh:
 	case <-harness.mockHooks.EmitEventCh:

website/content/docs/configuration/client.mdx

@@ -350,7 +350,7 @@ see the [drivers documentation](/docs/drivers).
 
 - `function_denylist` `([]string: ["plugin", "writeToFile"])` - Specifies a
   list of template rendering functions that should be disallowed in job specs.
-  By default the `plugin` and "writeToFile" functions are disallowed as they
+  By default the `plugin` and `writeToFile` functions are disallowed as they
   allow unrestricted root access to the host.
 
 - `disable_file_sandbox` `(bool: false)` - Allows templates access to arbitrary