wok diff flex/description.txt @ rev 21001

updated groff (1.21 -> 1.22.4)
author Hans-G?nter Theisgen
date Fri Mar 08 14:45:38 2019 +0100 (2019-03-08)
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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/flex/description.txt	Fri Mar 08 14:45:38 2019 +0100
     1.3 @@ -0,0 +1,2 @@
     1.4 +Flex is a tool for generating scanners. A scanner, sometimes called a tokenizer,
     1.5 +is a program which recognizes lexical patterns in text.