Fix minor typos

[kabilar]

Fix typos in the documentation markdown files and docstrings.

TODO:

• [NA] Add unit tests and/or doctests in docstrings
• [NA] Add docstrings and API docs for any new/modified user-facing classes and functions
• [NA] New/modified features documented in docs/user-guide/*.md
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[chuckwondo]

Fantastic. Thanks @kabilar!

[d-v-b]

some sensitive tests are failing, but I can fix that. thanks for this!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.26%. Comparing base (7c2f372) to head (196ed15).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3957   +/-   ##
=======================================
  Coverage   93.26%   93.26%           
=======================================
  Files          87       87           
  Lines       11721    11721           
=======================================
  Hits        10932    10932           
  Misses        789      789           

Files with missing lines	Coverage Δ
src/zarr/api/asynchronous.py	94.05% <ø> (ø)
src/zarr/api/synchronous.py	92.95% <ø> (ø)
src/zarr/core/array.py	97.87% <ø> (ø)
src/zarr/core/group.py	94.94% <ø> (ø)
src/zarr/core/sync.py	94.33% <ø> (ø)

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