Editing AA-awk-history

http://awk.freeshell.org/AA-awk-history\\ a concise history of awk and some of its forks\\ {{{ common name - date - source - notes oawk 1977 bell-labs [1] nawk 1985 bell-labs [2] bwk-awk 1987 princeton [3] polyawk/tawk ~1989 PolyTron [4] gawk 1986 gnu [5] mawk ? M.Brennan [6] busybox ? [7] }}} [1] the original - called oawk after 1985 extensions\\       http://lief.if.ufrgs.br/pub/linguagens/awk.pdf\\ [2] http://www.cs.bell-labs.com/cm/cs/awkbook/index.html\\       adds functions: close system atan2 sin cos rand srand match sub gsub\\       variables: ARGC ARGV FNR RSTART RLENGTH SUBSEP\\       keywords: do delete function return\\ [3] current maintainer - the dr. k of awk\\       http://www.cs.princeton.edu/~bwk/btl.mirror/\\       http://awk.freeshell.org/FIXES\\       https://github.com/danfuzz/one-true-awk\\ [4] first? commercial awk for ibm pc - sold back to Thomson\\       http://en.wikipedia.org/wiki/Polytron\\       https://groups.google.com/forum/#!topic/comp.lang.awk/NhB15575mdU\\ [5] most extensive extensions\\       https://www.gnu.org/software/gawk/\\       http://www.drdobbs.com/open-source/gnu-awk-this-is-not-your-fathers-awk/240158351\\ [6] often the fastest\\       http://invisible-island.net/mawk/\\  http://brenocon.com/blog/2009/09/dont-mawk-awk-the-fastest-and-most-elegant-big-data-munging-language/\\ [7] http://wiki.alpinelinux.org/wiki/Awk\\       http://www.busybox.net/\\ \\ also see http://awk.freeshell.org/AA-awk-one-page\\ revised 2013-10-25 17:21:44 by http://awk.freeshell.org/g0ph3r\\

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This change is a minor edit.

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