Update [doc]tests to include new sharding.read.* values

Author: aldenks

docs/user-guide/config.rst

@@ -88,4 +88,6 @@ This is the current default configuration::
     'default_zarr_format': 3,
     'json_indent': 2,
     'ndbuffer': 'zarr.core.buffer.cpu.NDBuffer',
+    'sharding': {'read': {'coalesce_max_bytes': 104857600,
+                          'coalesce_max_gap_bytes': 1048576}},
     'threading': {'max_workers': None}}

tests/test_config.py

@@ -103,13 +103,21 @@ def test_config_defaults_set() -> None:
                 "vlen-utf8": "zarr.codecs.vlen_utf8.VLenUTF8Codec",
                 "vlen-bytes": "zarr.codecs.vlen_utf8.VLenBytesCodec",
             },
+            "sharding": {
+                "read": {
+                    "coalesce_max_bytes": 104857600,  # 100 MiB
+                    "coalesce_max_gap_bytes": 1048576,  # 1 MiB
+                },
+            },
         }
     ]
     assert config.get("array.order") == "C"
     assert config.get("async.concurrency") == 10
     assert config.get("async.timeout") is None
     assert config.get("codec_pipeline.batch_size") == 1
     assert config.get("json_indent") == 2
+    assert config.get("sharding.read.coalesce_max_bytes") == 100 * 2**20  # 100 MiB
+    assert config.get("sharding.read.coalesce_max_gap_bytes") == 2**20  # 1 MiB
 
 
 @pytest.mark.parametrize(