Various spelling fixes for haddock comments. #1421

Job	Run time
rts-c-tests (ubuntu-latest)	35s
build (self-hosted)	33m 30s
pdf-driver (ubuntu-latest)	16m 15s
http-test-suite (ubuntu-latest)	10m 42s
Test PDF DOM	16m 33s
pdf-driver-cpp (ubuntu-latest)	9m 4s
Test Talos	10m 22s
Test Daedalus	11m 18s
Test Daedalus backends	12m 3s
Test Daedalus using make	9m 40s
	2h 10m 2s

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