chore: Update discovery artifacts (#1398)

## Deleted keys were detected in the following stable discovery artifacts:
displayvideo v1 https://github.com/googleapis/google-api-python-client/commit/f6b1a8e2d291c2ac9d2ea590101bb3c8c6fbe6cf

## Discovery Artifact Change Summary:
feat(displayvideo): update the api https://github.com/googleapis/google-api-python-client/commit/f6b1a8e2d291c2ac9d2ea590101bb3c8c6fbe6cf
diff --git a/docs/dyn/texttospeech_v1beta1.text.html b/docs/dyn/texttospeech_v1beta1.text.html
index f9c67f8..5233a02 100644
--- a/docs/dyn/texttospeech_v1beta1.text.html
+++ b/docs/dyn/texttospeech_v1beta1.text.html
@@ -139,9 +139,9 @@
     "volumeGainDb": 3.14, # Optional. Input only. Volume gain (in dB) of the normal native volume supported by the specific voice, in the range [-96.0, 16.0]. If unset, or set to a value of 0.0 (dB), will play at normal native signal amplitude. A value of -6.0 (dB) will play at approximately half the amplitude of the normal native signal amplitude. A value of +6.0 (dB) will play at approximately twice the amplitude of the normal native signal amplitude. Strongly recommend not to exceed +10 (dB) as there's usually no effective increase in loudness for any value greater than that.
   },
   "audioContent": "A String", # The audio data bytes encoded as specified in the request, including the header for encodings that are wrapped in containers (e.g. MP3, OGG_OPUS). For LINEAR16 audio, we include the WAV header. Note: as with all bytes fields, protobuffers use a pure binary representation, whereas JSON representations use base64.
-  "timepoints": [ # A link between a position in the original request input and a corresponding time in the output audio. It's only supported via `` of SSML input.
+  "timepoints": [ # A link between a position in the original request input and a corresponding time in the output audio. It's only supported via of SSML input.
     { # This contains a mapping between a certain point in the input text and a corresponding time in the output audio.
-      "markName": "A String", # Timepoint name as received from the client within `` tag.
+      "markName": "A String", # Timepoint name as received from the client within tag.
       "timeSeconds": 3.14, # Time offset in seconds from the start of the synthesized audio.
     },
   ],