[w3c/webauthn] 2d1bdc: fix grammar

  Branch: refs/heads/jeffh-fix-1012-attestedcreddata-length
  Home:   https://github.com/w3c/webauthn
  Commit: 2d1bdc88a22fcc33040240d4333afdf6da843f0c
      https://github.com/w3c/webauthn/commit/2d1bdc88a22fcc33040240d4333afdf6da843f0c
  Author: JeffH <Jeff.Hodges@PayPal.com>
  Date:   2018-08-01 (Wed, 01 Aug 2018)

  Changed paths:
    M index.bs

  Log Message:
  -----------
  fix grammar



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