feat: update v1beta1 proto (#594)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 409139454

Source-Link: googleapis/googleapis@7c10623

Source-Link: https://github.com/googleapis/googleapis-gen/commit/48051ebabf991abcddcb2685cefc331aea7f5208
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNDgwNTFlYmFiZjk5MWFiY2RkY2IyNjg1Y2VmYzMzMWFlYTdmNTIwOCJ9

Author: gcf-owl-bot[bot]

google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1/package-info.java

@@ -15,7 +15,9 @@
  */
 
 /**
- * The interfaces provided are listed below, along with usage samples.
+ * A client to Cloud Text-to-Speech API
+ *
+ * <p>The interfaces provided are listed below, along with usage samples.
  *
  * <p>======================= TextToSpeechClient =======================
  *

google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1beta1/TextToSpeechClient.java

@@ -154,11 +154,11 @@ public TextToSpeechStub getStub() {
    * @param languageCode Optional. Recommended.
    *     [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag. If not specified, the
    *     API will return all supported voices. If specified, the ListVoices call will only return
-   *     voices that can be used to synthesize this language_code. E.g. when specifying "en-NZ", you
-   *     will get supported "en-NZ" voices; when specifying "no", you will get supported
-   *     "no-\\*" (Norwegian) and "nb-\\*" (Norwegian Bokmal) voices; specifying "zh" will
-   *     also get supported "cmn-\\*" voices; specifying "zh-hk" will also get supported
-   *     "yue-hk" voices.
+   *     voices that can be used to synthesize this language_code. E.g. when specifying `"en-NZ"`,
+   *     you will get supported `"en-NZ"` voices; when specifying `"no"`, you will get supported
+   *     `"no-\\*"` (Norwegian) and `"nb-\\*"` (Norwegian Bokmal) voices; specifying `"zh"`
+   *     will also get supported `"cmn-\\*"` voices; specifying `"zh-hk"` will also get
+   *     supported `"yue-hk"` voices.
    * @throws com.google.api.gax.rpc.ApiException if the remote call fails
    */
   public final ListVoicesResponse listVoices(String languageCode) {

google-cloud-texttospeech/src/main/java/com/google/cloud/texttospeech/v1beta1/package-info.java

@@ -15,7 +15,9 @@
  */
 
 /**
- * The interfaces provided are listed below, along with usage samples.
+ * A client to Cloud Text-to-Speech API
+ *
+ * <p>The interfaces provided are listed below, along with usage samples.
  *
  * <p>======================= TextToSpeechClient =======================
  *