docs: fix typo in docstring of Image.flip_horizontally

[lars-reimann]

Closes #583

Summary of Changes

Replace Ìmage with Image in docstring of Image.flip_horizontally.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	1	0	0	0.62s
✅ PYTHON	mypy	1		0	1.43s
✅ PYTHON	ruff	1	0	0	0.16s
✅ REPOSITORY	git_diff	yes		no	0.26s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (d490dee) to head (6a391c6).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #589   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           53        53           
  Lines         3198      3198           
=========================================
  Hits          3198      3198           

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[lars-reimann]

🎉 This PR is included in version 0.20.0 🎉

The release is available on:

• v0.20.0
• GitHub release

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