Add transcript for pyx 520 and fix some older transcripts.

Author: mikeckennedy

transcripts/077_20_python_packages.txt

@@ -2392,7 +2392,7 @@
 
 01:08:47 So a good example is something that I've been doing at work for the past week, which is converting our protocol buffer code away from using Google's protocol buffer implementation to using a new tool called Pyrobuff.
 
-01:08:59 Pyrobuff is itself written in Cython, and it generates a PYX file for you to use as your object implementation of the protocol buffer rather than just using your normal Python-based implementation of the protocol buffer.
+01:08:59 Pyrobuff is itself written in Cython, and it generates a pyx file for you to use as your object implementation of the protocol buffer rather than just using your normal Python-based implementation of the protocol buffer.
 
 01:09:12 I'm not going to go into what the protocol buffers are, but basically it's exactly what you were saying, object serialization that you shuffle between two places.
 

transcripts/077_20_python_packages.vtt

@@ -3607,7 +3607,7 @@ Yeah, absolutely.
 So a good example is something that I've been doing at work for the past week, which is converting our protocol buffer code away from using Google's protocol buffer implementation to using a new tool called Pyrobuff.
 
 01:08:59.740 --> 01:09:12.140
-Pyrobuff is itself written in Cython, and it generates a PYX file for you to use as your object implementation of the protocol buffer rather than just using your normal Python-based implementation of the protocol buffer.
+Pyrobuff is itself written in Cython, and it generates a pyx file for you to use as your object implementation of the protocol buffer rather than just using your normal Python-based implementation of the protocol buffer.
 
 01:09:12.440 --> 01:09:19.020
 I'm not going to go into what the protocol buffers are, but basically it's exactly what you were saying, object serialization that you shuffle between two places.