Minor spelling fixes #1636

Job	Run time
RuboCop	24s
specs (ubuntu, 3.0.6)	1m 27s
specs (ubuntu, 3.1.4)	1m 28s
specs (ubuntu, 3.2.2)	1m 26s
specs (ubuntu, 3.3.0)	1m 24s
specs (macos, 3.0.6)	1m 30s
specs (macos, 3.1.4)	1m 25s
specs (macos, 3.2.2)	1m 11s
specs (macos, 3.3.0)	2m 26s
specs (windows, 3.0.6)	4m 9s
specs (windows, 3.1.4)	5m 51s
specs (windows, 3.2.2)	3m 58s
specs (windows, 3.3.0)	4m 59s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 22s
	33m 0s

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