Fix README for speech (#413)

Author: puneith

speech/api/README.md

@@ -40,24 +40,20 @@ for more information.
 
 ### Install the dependencies
 
+The sample uses the [PyAudio][pyaudio] library to stream audio from your computer's microphone.  PyAudio depends on [PortAudio][portaudio], which may need to be compiled when you install PyAudio. If you run into compilation issues that mention PortAudio, you may have to [install some dependencies][pyaudio-install].
+
 * If you're running the `speech_rest.py` sample:
 
     ```sh
-    $ pip install -r requirements-speech_rest.txt
+    $ sudo pip install -r requirements-speech_rest.txt
     ```
 
 * If you're running the `speech_streaming.py` sample:
 
     ```sh
-    $ pip install -r requirements-speech_grpc.txt
+    $ sudo pip install -r requirements-speech_grpc.txt
     ```
 
-    The sample uses the [PyAudio][pyaudio] library to stream audio from your
-    computer's microphone.  PyAudio depends on [PortAudio][portaudio], which may
-    need to be compiled when you install PyAudio. If you run into compilation
-    issues that mention PortAudio, you may have to [install some
-    dependencies][pyaudio-install].
-
 [pyaudio]: https://people.csail.mit.edu/hubert/pyaudio/
 [portaudio]: http://www.portaudio.com/
 [pyaudio-install]: https://people.csail.mit.edu/hubert/pyaudio/#downloads