Proposed resolution:

To [headers] Table 11, C++ Library Headers, add "<strstream>".

In the following places, change "clauses 17 through 27" to "clauses 17 through 27 and Annex D":

• [intro.refs] Normative references/1/footnote 1
• [intro.defs] Definitions/1
• [dcl.dcl] Library introduction/9
• [description] Method of description (Informative)/1
• [character.seq] Character sequences/1/bullet 2
• [functions.within.classes] Functions within classes/1
• [objects.within.classes] Private members/1/(2 places)
• [requirements] Library-wide requirements/1
• [headers] Headers/4
• [replacement.functions] Replacement functions/1
• [global.functions] Global or non-member functions/2
• [protection.within.classes] Protection within classes/1

From c++std-edit-873:

[headers], Table 11. In this table, the header <strstream> is missing.

This shows a general problem: The whole clause 17 refers quite often to clauses 18 through 27, but D.7 is also a part of the standard library (though a deprecated one).