[perl6/specs] 990d52: Add "XS" to glossary

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: 990d5260656f52175306036a10c85af26ed5731c
      
https://github.com/perl6/specs/commit/990d5260656f52175306036a10c85af26ed5731c
  Author: Anthony Parsons <flusse...@gmail.com>
  Date:   2015-11-05 (Thu, 05 Nov 2015)

  Changed paths:
    M S99-glossary.pod

  Log Message:
  -----------
  Add "XS" to glossary