Proposed resolution:

This wording is relative to N4606.

Add to the end of the <iomanip> synopsis in [iostream.format.overview]

template <class charT, class traits>
  T15 quoted(basic_string_view<charT, traits> s,
             charT delim = charT(’"’), charT escape = charT(’\\’));

Add to [quoted.manip] at the end of p2:

template <class charT, class traits>
  unspecified quoted(basic_string_view<charT, traits> s,
                            charT delim = charT(’"’), charT escape = charT(’\\’));

Modify [quoted.manip]/3 as follows:

Returns: An object of unspecified type such that if out is an instance of basic_ostream with member type char_type the same as charT and with member type traits_type which in the second and third forms is the same as traits, then the expression out << quoted(s, delim, escape) behaves as a formatted output function (27.7.3.6.1) of out. This forms a character sequence seq, initially consisting of the following elements: