Improved API docs for MutableBitmap

[jorgecarleitao]

Shuffled functions around to make more prevalent methods show first in rust docs

[codecov]

Codecov Report

Merging #1025 (8d896e8) into main (266fbbe) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #1025      +/-   ##
==========================================
- Coverage   71.62%   71.62%   -0.01%     
==========================================
  Files         359      359              
  Lines       19907    19916       +9     
==========================================
+ Hits        14259    14265       +6     
- Misses       5648     5651       +3     

Impacted Files	Coverage Δ
src/bitmap/mutable.rs	89.16% <66.66%> (-1.10%)	⬇️
src/bitmap/utils/slice_iterator.rs	87.93% <0.00%> (+1.72%)	⬆️

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