Fix error in docs save/load table

[ascillitoe]

Resolve #609.

[codecov-commenter]

Codecov Report

Merging #640 (04d7a96) into master (1e53f70) will decrease coverage by 0.10%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #640      +/-   ##
==========================================
- Coverage   78.84%   78.73%   -0.11%     
==========================================
  Files         123      123              
  Lines        8753     8753              
==========================================
- Hits         6901     6892       -9     
- Misses       1852     1861       +9     

Flag	Coverage Δ
ubuntu-latest-3.10.6	78.73% <ø> (ø)
ubuntu-latest-3.8	?
ubuntu-latest-3.9	?
windows-latest-3.9	?

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Impacted Files	Coverage Δ
alibi_detect/utils/_types.py	68.96% <0.00%> (-24.14%)	⬇️
alibi_detect/utils/frameworks.py	87.50% <0.00%> (-4.17%)	⬇️