bug#12973: @: overused in manual

[Richard Stallman]

    But if one looks up @:, which is in another section, they will not see
    that "X." doesn't need a @:.  And that is a problem, because "Not
    Ending a Sentence" should have pointed to "Ending a Sentence" or told
    explicitly that @: is not required in those cases.

I explicitly decided NOT to say this.  I don't remember for certain
why I made that decision, but it was not an omission.  Maybe it
was to simplify the rules for Texinfo; maybe it is for some
other formatter's sake.

-- 
Dr Richard Stallman
President, Free Software Foundation
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