docs: fix zstd/zlib references in docs (#373)

Author: durran

source/fundamentals/connection/network-compression.txt

@@ -20,7 +20,7 @@ first one in the list supported by your MongoDB instance.
 
 .. note::
 
-   When using the Snappy or Zlib compression algorithm, you must
+   When using the Snappy or Zstandard compression algorithm, you must
    :ref:`add explicit dependencies <compression-dependencies>`.
 
 .. _enable-compression:
@@ -89,7 +89,7 @@ following code:
 
    npm install --save snappy
 
-To add the Zlib compression algorithm to your application, run the
+To add the Zstandard compression algorithm to your application, run the
 following code: 
 
 .. code-block:: javascript