bug#74107: Spurious ".IP" macros in a few coreutils 9.5 man pages

[Glenn Golden]

A few man pages from coreutils 9.5 seem to have spurious ".IP" troff macros
in several places.  Noticed in tail.1, timeout.1.  Not present in cat.1, df.1,
du.1, ls.1, rm.1, tr.1. Did not check others.

See attached screenshots of rendered pages for tail and timeout. The extra
vertical spacings seem to be due to what appear to be spurious .IP macros.

Platform/version info:
   Arch linux, coreutils package 9.5-2 (latest), commodity x86_64 laptop.

format_ex_1.png
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format_ex_2.png
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