[btcsuite/btcd] 8fcea8: Fixed erroneous txscript.KeyClosure documentation.

[Jonathan Gillham]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcd
  Commit: 8fcea82a568cac918238ba6f196de81a01f4d887
      
https://github.com/btcsuite/btcd/commit/8fcea82a568cac918238ba6f196de81a01f4d887
  Author: Jonathan Gillham <jongill...@users.noreply.github.com>
  Date:   2015-07-19 (Sun, 19 Jul 2015)

  Changed paths:
    M txscript/sign.go

  Log Message:
  -----------
  Fixed erroneous txscript.KeyClosure documentation.