Fixed spelling issues. #13206

Job	Run time
Test suite with Python nightly	14m 22s
Test mypyc suite with 32-bit Python	6m 42s
Test suite with py38-ubuntu, mypyc-compiled	17m 43s
Test suite with py38-windows-64	21m 5s
Test suite with py39-ubuntu	17m 59s
Test suite with py310-ubuntu	15m 32s
Test suite with py311-ubuntu, mypyc-compiled	15m 34s
Test suite with py312-ubuntu, mypyc-compiled	18m 2s
mypyc runtime tests with py39-macos	7m 35s
mypyc runtime tests with py38-debug-build-ubuntu	4m 21s
Type check our own code (py38-ubuntu)	2m 0s
Type check our own code (py38-windows-64)	2m 17s
Formatting and code style with Black + ruff	37s
	2h 23m 49s

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