[READY] Fix typo in error text #356

Job	Run time
rubocop	13s
Unit test (ubuntu-20.04, 3)	18s
Unit test (ubuntu-20.04, 3.1)	22s
Unit test (ubuntu-20.04, 3.2)	21s
Unit test (ubuntu-20.04, 3.3)	18s
Unit test (ubuntu-20.04, jruby-9.4)	53s
Unit test (ubuntu-20.04, truffleruby)	1m 49s
Unit test (macos-latest, 3)	21s
Unit test (macos-latest, 3.1)	21s
Unit test (macos-latest, 3.2)	22s
Unit test (macos-latest, 3.3)	26s
Unit test (macos-latest, jruby-9.4)	38s
Unit test (macos-latest, truffleruby)	1m 26s
Unit test (windows-latest, 3)	1m 36s
Unit test (windows-latest, 3.1)	1m 46s
Unit test (windows-latest, 3.2)	2m 13s
Unit test (windows-latest, 3.3)	2m 27s
finish	2s
	15m 52s

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