texinfo: @dots

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14.7.4 '@dots' (...) and '@enddots' (...)
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An "ellipsis" (a sequence of dots) would be spaced wrong when typeset as
a string of periods, so a special command is used in Texinfo: use the
'@dots{}' command to generate a normal ellipsis, which is three dots in
a row, appropriately spaced ... like so.  To emphasize: do not simply
write three periods in the input file; that would work for the Info file
output, but would produce the wrong amount of space between the periods
in the printed manual.

  The '@enddots{}' command generates an end-of-sentence ellipsis, which
also has three dots, but with different spacing afterwards, ...  Look
closely to see the difference.

  Here is an ellipsis: ... Here are three periods in a row: ...

  In printed (and usually HTML) output, the three periods in a row are
much closer together than the dots in the ellipsis.