[perl6/specs] dfad56: mention that \x is SSA semantics

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/perl6/specs
  Commit: dfad56106318368e008c7e18214b4029411218dd
      
https://github.com/perl6/specs/commit/dfad56106318368e008c7e18214b4029411218dd
  Author: TimToady <la...@wall.org>
  Date:   2015-08-06 (Thu, 06 Aug 2015)

  Changed paths:
    M S06-routines.pod

  Log Message:
  -----------
  mention that \x is SSA semantics