Fix spelling errors (#21665)
Summary:
alloctor -> allocator
excutable -> executable
excution -> execution
foward -> forward
initiaize -> initialize
paralell -> parallel
preprocesor -> preprocessor
tranpose -> transpose
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21665
Differential Revision: D15806155
Pulled By: soumith
fbshipit-source-id: d92b21ec8650a2b32f05faf9af0b7d2b073e992c
