Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
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+
+<h1><a href="texttospeech_v1.html">Cloud Text-to-Speech API</a> . <a href="texttospeech_v1.text.html">text</a></h1>
+<h2>Instance Methods</h2>
+<p class="toc_element">
+  <code><a href="#synthesize">synthesize(body, x__xgafv=None)</a></code></p>
+<p class="firstline">Synthesizes speech synchronously: receive results after all text input</p>
+<h3>Method Details</h3>
+<div class="method">
+    <code class="details" id="synthesize">synthesize(body, x__xgafv=None)</code>
+  <pre>Synthesizes speech synchronously: receive results after all text input
+has been processed.
+
+Args:
+  body: object, The request body. (required)
+    The object takes the form of:
+
+{ # The top-level message sent by the client for the `SynthesizeSpeech` method.
+    "input": { # Contains text input to be synthesized. Either `text` or `ssml` must be # Required. The Synthesizer requires either plain text or SSML as input.
+        # supplied. Supplying both or neither returns
+        # google.rpc.Code.INVALID_ARGUMENT. The input size is limited to 5000
+        # characters.
+      "text": "A String", # The raw text to be synthesized.
+      "ssml": "A String", # The SSML document to be synthesized. The SSML document must be valid
+          # and well-formed. Otherwise the RPC will fail and return
+          # google.rpc.Code.INVALID_ARGUMENT. For more information, see
+          # [SSML](/speech/text-to-speech/docs/ssml).
+    },
+    "voice": { # Description of which voice to use for a synthesis request. # Required. The desired voice of the synthesized audio.
+      "ssmlGender": "A String", # The preferred gender of the voice. Optional; if not set, the service will
+          # choose a voice based on the other parameters such as language_code and
+          # name. Note that this is only a preference, not requirement; if a
+          # voice of the appropriate gender is not available, the synthesizer should
+          # substitute a voice with a different gender rather than failing the request.
+      "languageCode": "A String", # The language (and optionally also the region) of the voice expressed as a
+          # [BCP-47](https://www.rfc-editor.org/rfc/bcp/bcp47.txt) language tag, e.g.
+          # "en-US". Required. This should not include a script tag (e.g. use
+          # "cmn-cn" rather than "cmn-Hant-cn"), because the script will be inferred
+          # from the input provided in the SynthesisInput.  The TTS service
+          # will use this parameter to help choose an appropriate voice.  Note that
+          # the TTS service may choose a voice with a slightly different language code
+          # than the one selected; it may substitute a different region
+          # (e.g. using en-US rather than en-CA if there isn't a Canadian voice
+          # available), or even a different language, e.g. using "nb" (Norwegian
+          # Bokmal) instead of "no" (Norwegian)".
+      "name": "A String", # The name of the voice. Optional; if not set, the service will choose a
+          # voice based on the other parameters such as language_code and gender.
+    },
+    "audioConfig": { # Description of audio data to be synthesized. # Required. The configuration of the synthesized audio.
+      "audioEncoding": "A String", # Required. The format of the requested audio byte stream.
+      "effectsProfileId": [ # An identifier which selects 'audio effects' profiles that are applied on
+          # (post synthesized) text to speech.
+          # Effects are applied on top of each other in the order they are given.
+          # See
+          #
+          # [audio-profiles](https:
+          # //cloud.google.com/text-to-speech/docs/audio-profiles)
+          # for current supported profile ids.
+        "A String",
+      ],
+      "sampleRateHertz": 42, # The synthesis sample rate (in hertz) for this audio. Optional.  If this is
+          # different from the voice's natural sample rate, then the synthesizer will
+          # honor this request by converting to the desired sample rate (which might
+          # result in worse audio quality), unless the specified sample rate is not
+          # supported for the encoding chosen, in which case it will fail the request
+          # and return google.rpc.Code.INVALID_ARGUMENT.
+      "pitch": 3.14, # Optional speaking pitch, in the range [-20.0, 20.0]. 20 means increase 20
+          # semitones from the original pitch. -20 means decrease 20 semitones from the
+          # original pitch.
+      "speakingRate": 3.14, # Optional speaking rate/speed, in the range [0.25, 4.0]. 1.0 is the normal
+          # native speed supported by the specific voice. 2.0 is twice as fast, and
+          # 0.5 is half as fast. If unset(0.0), defaults to the native 1.0 speed. Any
+          # other values < 0.25 or > 4.0 will return an error.
+      "volumeGainDb": 3.14, # Optional 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.
+    },
+  }
+
+  x__xgafv: string, V1 error format.
+    Allowed values
+      1 - v1 error format
+      2 - v2 error format
+
+Returns:
+  An object of the form:
+
+    { # The message returned to the client by the `SynthesizeSpeech` method.
+    "audioContent": "A String", # The audio data bytes encoded as specified in the request, including the
+        # header (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.
+  }</pre>
+</div>
+
+</body></html>
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