More small bits of doc polishing #4057

Job	Run time
msvc	11m 42s
gcc	13m 12s
msvc (CHECKS=nodep)	10m 37s
msvc (OPTS=static)	11m 35s
gcc (CFLAGS=-DTCL_NO_DEPRECATED=1)	13m 0s
msvc (OPTS=noembed)	11m 7s
gcc (--disable-shared)	13m 17s
msvc (OPTS=symbols)	11m 40s
gcc (--disable-zipfs)	13m 1s
msvc (OPTS=symbols STATS=compdbg,memdbg)	14m 31s
gcc (--enable-symbols)	13m 19s
gcc (--enable-symbols=mem)	14m 27s
gcc (--enable-symbols=all)	14m 57s
	2h 46m 25s

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