* document the new MAY_FLATTEN bit (which corresponds to Perl 6's   "flatten in slurpy context" sigil hinter).
* document the new MAY_FLATTEN bit (which corresponds to Perl 6's
  "flatten in slurpy context" sigil hinter).

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@8371 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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