[bug #62339] [doc]: Add a remark about a pitfall using \s0

[Bjarni Ingi Gislason]

Follow-up Comment #4, bug #62339 (project groff):

  There must be a separate paragraph about "\s0" and mentioning of 0
for \s+-N dropped.

  Adding text to document the use of "\s0":

\s0     Restores the previous type size.

        Does not restore the intended type size if there is a type size
        shift before it, like "\s<i>...\s<n>...\s0...\s0" (restores
        \s<i>+<n>, not that before \s<i>).

        The best practice is not to use it.

        The second best practice is not to use it after a variable,
        as it might contain "\s0".



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