[Tiny] Updated htype docstring for segment mask

[istranic]

🚀 🚀 Pull Request

Checklist:

• My code follows the style guidelines of this project and the Contributing document
• I have commented my code, particularly in hard-to-understand areas
• I have kept the coverage-rate up
• I have performed a self-review of my own code and resolved any problems
• I have checked to ensure there aren't any other open Pull Requests for the same change
• I have described and made corresponding changes to the relevant documentation
• New and existing unit tests pass locally with my changes

Changes

[codecov]

Codecov Report

Merging #1264 (43ae81d) into main (8bf5534) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1264      +/-   ##
==========================================
- Coverage   91.60%   91.52%   -0.09%     
==========================================
  Files         138      138              
  Lines        9506     9506              
==========================================
- Hits         8708     8700       -8     
- Misses        798      806       +8     

Impacted Files	Coverage Δ
hub/htype.py	100.00% <ø> (ø)
hub/api/tests/test_api.py	99.38% <100.00%> (ø)
hub/core/lock.py	82.22% <0.00%> (-8.89%)	⬇️

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