[DOC] Update -l option [ci skip]

`-l` option has used `chomp!` since Ruby 2.5.  [Bug #12926]
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Nobuyoshi Nakada 2020-11-30 19:06:25 +09:00
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@ -313,7 +313,7 @@ Enables automatic line-ending processing, which means to firstly set
to the value of
.Li "$/" ,
and secondly chops every line read using
.Li chop! .
.Li chomp! .
.Pp
.It Fl n
Causes Ruby to assume the following loop around your script, which