docs: fix minor docstring formatting

Google APIs · copybara-github · commit 45c90e286e35 · 2022-12-14T07:29:30.000-08:00
PiperOrigin-RevId: 495308712
diff --git a/google/cloud/texttospeech/v1beta1/cloud_tts_lrs.proto b/google/cloud/texttospeech/v1beta1/cloud_tts_lrs.proto
@@ -56,7 +56,7 @@ service TextToSpeechLongAudioSynthesize {
 // `SynthesizeLongAudio` method.
 message SynthesizeLongAudioRequest {
   // The resource states of the request in the form of
-  // projects/*/locations/*/voices/*.
+  // `projects/*/locations/*/voices/*`.
   string parent = 1;
 
   // Required. The Synthesizer requires either plain text or SSML as input.
