Fix crash in #to_html of @deprected tag.

    end

    def to_html(context)

      v = context[:deprecated][:version] ? "since " + context[:deprecated][:version] : ""

      depr = context[:deprecated]

      v = depr[:version] ? "since " + depr[:version] : ""

      <<-EOHTML

        <div class='signature-box deprecated'>

        <p>This #{context[:tagname]} has been <strong>deprecated</strong> #{v}</p>