Apply suggestions from code review

Co-authored-by: Justus Magin <keewis@users.noreply.github.com>

Author: maxrjones

xarray/backends/zarr.py

@@ -326,14 +326,14 @@ def _determine_zarr_chunks(enc_chunks, var_chunks, ndim, name, zarr_format):
 
         if any(len(set(chunks[:-1])) > 1 for chunks in var_chunks):
             raise ValueError(
-                "Zarr v2 requires uniform chunk sizes except for final chunk. "
+                "Zarr v2 requires uniform chunk sizes except for the final chunk. "
                 f"Variable named {name!r} has incompatible dask chunks: {var_chunks!r}. "
                 "Consider rechunking using `chunk()`, or switching to the "
                 "zarr v3 format with zarr-python>=3.2."
             )
         if any((chunks[0] < chunks[-1]) for chunks in var_chunks):
             raise ValueError(
-                "Final chunk of a Zarr v2 array or a Zarr v3 array without the "
+                "The final chunk of a Zarr v2 array or a Zarr v3 array without the "
                 "rectilinear chunks extension must be the same size or smaller "
                 f"than the first. Variable named {name!r} has incompatible Dask "
                 f"chunks {var_chunks!r}. "