docs: small typo in translate example (GoogleCloudPlatform#1086)

Author: ey00

translate/src/translate_with_model.php

@@ -34,7 +34,7 @@
 use Google\Cloud\Translate\TranslateClient;
 
 /** Uncomment and populate these variables in your code */
-// $text = 'The text to translate."
+// $text = 'The text to translate.'
 // $targetLanguage = 'ja';  // Language to translate to
 
 $model = 'nmt';  // "base" for standard edition, "nmt" for premium