Editing mawk

The **mawk** package provides a very fast awk implementation by Mike Brennan[1] based on a byte code interpreter. It is currently maintained by Thomas E. Dickey. [[http://invisible-island.net/mawk/mawk.html|mawk homepage]] mawk aims to be compatible with the awk language, as described in the book "The AWK Programming Language" published in 1988, and therefore should be compatible with [[bwk]]. It also adds POSIX conformance and a few extensions. See also: [[libmawk]] [1] Brennan still maintains his own version of **mawk** called **mawk-2** which differs from the current version developed by Dickey; it can be found at https://github.com/mikebrennan000/mawk-2

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This change is a minor edit.

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