refine documentation and error messages

Author: Carreau

zarr/creation.py

@@ -430,7 +430,12 @@ def open_array(
     storage_options : dict
         If using an fsspec URL to create the store, these will be passed to
         the backend implementation. Ignored otherwise.
-    partial_decompress:
+    partial_decompress : bool, optional
+        If True and while the chunk_store is a FSStore and the compresion used
+        is Blosc, when getting data from the array chunks will be partially
+        read and decompressed when possible.
+
+        .. versionadded:: 2.7
 
     Returns
     -------

zarr/indexing.py

@@ -889,8 +889,8 @@ def __init__(self, selection, arr_shape):
         if len(selection) > len(self.arr_shape):
             raise ValueError(
                 "Selection has more dimensions then the array:\n"
-                "selection dimensions = {len(selection)\n"
-                "array dimensions = {len(self.arr_shape)}"
+                f"selection dimensions = {len(selection)}\n"
+                f"array dimensions = {len(self.arr_shape)}"
             )
 
         # any selection can not be out of the range of the chunk