removing mentions of obsolete option force_simple_split #509

Job	Run time
test_matrix (ubuntu, 2.5)	27s
test_matrix (ubuntu, 2.6)	24s
test_matrix (ubuntu, 2.7)	25s
test_matrix (ubuntu, 3.0)	16s
test_matrix (ubuntu, 3.1)	13s
test_matrix (ubuntu, 3.2)	14s
test_matrix (ubuntu, 3.3)	16s
test_matrix (ubuntu, head)	12s
test_matrix (ubuntu, truffleruby)	41s
test_matrix (ubuntu, truffleruby-head)	58s
test_matrix (ubuntu, jruby)	48s
test_matrix (ubuntu, jruby-head)	50s
test_matrix (macos, 2.5)	5s
test_matrix (macos, 2.6)	33s
test_matrix (macos, 2.7)	32s
test_matrix (macos, 3.0)	15s
test_matrix (macos, 3.1)	19s
test_matrix (macos, 3.2)	14s
test_matrix (macos, 3.3)	17s
test_matrix (macos, head)	15s
test_matrix (macos, truffleruby)	37s
test_matrix (macos, truffleruby-head)	45s
test_matrix (macos, jruby)	36s
test_matrix (macos, jruby-head)	37s
finish	0s
	10m 49s

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