a few more comments on dispatch key computation methods

[bhosmer]

Stack from ghstack:

• [dispatcher] avoid autograd fixup step on non-backend keys #46135 [dispatcher] avoid autograd fixup step on non-backend keys
• a few more comments on dispatch key computation methods #46128 a few more comments on dispatch key computation methods

Differential Revision: D24233868

[codecov]

Codecov Report

Merging #46128 into gh/bhosmer/52/base will increase coverage by 0.00%.
The diff coverage is n/a.

@@                 Coverage Diff                 @@
##           gh/bhosmer/52/base   #46128   +/-   ##
===================================================
  Coverage               68.20%   68.20%           
===================================================
  Files                     410      410           
  Lines                   53453    53453           
===================================================
+ Hits                    36457    36458    +1     
+ Misses                  16996    16995    -1     

Impacted Files	Coverage Δ
torch/testing/_internal/expecttest.py	78.57% <0.00%> (+1.02%)	⬆️

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[facebook-github-bot]

@bhosmer merged this pull request in 9f74301.