Update gpu.md

[AdamWysokinski]

typos fixed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.55%. Comparing base (4fea1f9) to head (1e5f986).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2539       +/-   ##
===========================================
+ Coverage   32.69%   65.55%   +32.86%     
===========================================
  Files          34       35        +1     
  Lines        1976     2015       +39     
===========================================
+ Hits          646     1321      +675     
+ Misses       1330      694      -636     

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