doc: improvements in sub + replace variants.

* txr.1: The wording is improved in the description of
sub-list, replace-list and all the other type specific
specializations of sub and replace. We avoid starting the
descriptions with "This function", and vague wording such
as "is like the sub function".  Superfluous, obvious text like
"for a description of the semantics, see the sub function" is
removed. Also we avoid saying that the sub-list and
replace-list functions operate strictly on lists, since they
in fact operate on anything that supports list operations.

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