wish doc: change synopsis from "wish ?-encoding encoding?" to "wish ?… #1508

Job	Run time
test (gcc)	4m 39s
build (gcc)	1m 39s
build (gcc, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 40s
build (gcc, --disable-xft)	2m 13s
test (gcc, --disable-xft)	4m 12s
test (gcc, --enable-symbols)	3m 36s
build (gcc, --disable-xss)	2m 23s
build (gcc, --enable-symbols)	1m 13s
build (clang)	2m 38s
build (clang, CFLAGS=-DTK_NO_DEPRECATED=1)	1m 55s
build (clang, --disable-xft)	1m 51s
build (clang, --disable-xss)	1m 55s
build (clang, --enable-symbols)	1m 29s
	31m 23s

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