various: fix miscellaneous typos #803

Job	Run time
Rubocop	24s
Ruby 2.7 (Windows)	3m 4s
Legacy Ruby Builds (2.1.9)	35s
Ruby 2.6 (Windows)	3m 0s
Ruby 2.5 (Windows)	2m 51s
Legacy Ruby Builds (2.0)	35s
Ruby 3.3	21s
Ruby 2.4 (Windows)	2m 31s
Legacy Ruby Builds (1.9.3)	42s
Ruby 3.2	25s
Ruby 2.3 (Windows)	1m 55s
Legacy Ruby Builds (1.9.2)	44s
Ruby 3.1	25s
Ruby 3.0	25s
Ruby 2.2 (Windows)	2m 13s
Legacy Ruby Builds (1.8.7)	45s
Ruby 2.7	47s
Legacy Ruby Builds (REE)	51s
Ruby 2.6	53s
Legacy Ruby Builds (JRuby 1.7)	42s
Legacy Ruby Builds (JRuby 1.7 1.8 mode)	40s
Ruby 2.5	47s
Legacy Ruby Builds (JRuby 9.1.17.0)	48s
Ruby 2.4	42s
Ruby 2.3	49s
Ruby 2.2	1m 6s
Ruby ruby-head	21s
Ruby jruby-9.2.13.0	1m 52s
Ruby 2.7 with diff-lcs 1.3	46s
Ruby 2.7 with diff-lcs 1.4.3	50s
	32m 49s

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