Add typos (and fix them) #366

Job	Run time
conda (ubuntu, conda-forge, stable)	44s
Address sanitizer	1m 29s
conda (windows, conda-forge, stable)	1m 57s
mpi-runner	1m 24s
rustfmt	56s
static builds (ubuntu-latest, stable)	1m 25s
Spell checking (typos)	7s
conda (macos, conda-forge, stable)	54s
static builds (windows-latest, stable-msvc)	4m 59s
test apt (stable)	35s
static builds (windows-latest, stable-gnu)	5m 32s
test apt (beta)	44s
static builds (macos-12, stable)	3m 16s
test apt (nightly)	44s
static builds (macos-latest, stable)	2m 33s
	27m 19s

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