Update hash function to use unsigned 32-bit integer

[davidlowryduda]

What does this PR do?

This pull request updates the MinHash documentation to clarify the requirements for the hash function and to ensure compatibility with unsigned 32-bit integers.

This solves issue #303

Checklist

• Are unit tests passing?
• Documentation added/updated for all public APIs?

[gemini-code-assist]

Summary of Changes

Hello @davidlowryduda, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the MinHash documentation by clarifying the requirements for user-defined hash functions. It ensures that the provided examples correctly reflect the need for unsigned 32-bit integer outputs, thereby improving the accuracy and usability of the documentation and resolving a specific issue.

Highlights

• Documentation Clarification: The documentation for MinHash has been updated to explicitly state that custom hash functions must output an unsigned 32-bit integer, providing clearer guidance for users.
• Example Code Update: The example _hash_func in the MinHash documentation was modified to correctly demonstrate the use of mmh3.hash(d, signed=False) to generate an unsigned 32-bit hash, aligning with the clarified requirements.

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[gemini-code-assist]

Code Review

This pull request correctly updates the documentation in docs/minhash.rst to clarify that MinHash requires a hash function that produces unsigned 32-bit integers. The example code is updated to use mmh3.hash(d, signed=False), which correctly produces an unsigned integer, unlike the previous mmh3.hash32(d). This change makes the documentation more accurate and less misleading for users. For further consistency, you may also want to update the docstring for the hashfunc parameter in the MinHash class constructor to specify 'unsigned 32-bit integer'.