Note support of different implementations varied

Author: jakirkham

_posts/2019-05-02-zarr-2.3-release.md

@@ -145,9 +145,9 @@ how to share large blocks of memory between different libraries without
 copying. This protocol has evolved over time from its original introduction in
 Python 2 and later revamped implementation added in Python 3 (with backports to
 Python 2.6 and 2.7). Due to the changes in its behavior from Python 2 to Python
-3 and what objects supported which parts of the buffer protocol, it was a bit
-challenging to leverage effectively in Zarr. This despite the value of having
-zero-copy when storing data or performing filtering and compression.
+3 and what objects supported which implementation of the buffer protocol, it
+was a bit challenging to leverage effectively in Zarr. This despite the value
+of having zero-copy when storing data or performing filtering and compression.
 
 Thanks to some under-the-hood changes in Numcodecs 0.6 and Zarr 2.3, the buffer
 protocol is now cleanly supported for Python 2/3 in both libraries when working