[container.adaptors] Index missing members of the containers

Add the missing containers to index the operations defined by
the container requirements clauses.

Author: AlisdairM

source/containers.tex

@@ -122,6 +122,10 @@
 \indexlibrarymemberx{unordered_set}{#1}%
 \indexlibrarymemberx{unordered_multiset}{#1}%
 \indexlibrarymemberx{unordered_multimap}{#1}%
+\indexlibrarymemberx{flat_map}{#1}%
+\indexlibrarymemberx{flat_set}{#1}%
+\indexlibrarymemberx{flat_multiset}{#1}%
+\indexlibrarymemberx{flat_multimap}{#1}%
 }
 
 \pnum
@@ -733,6 +737,10 @@
 \indexlibrarymemberx{unordered_set}{#1}%
 \indexlibrarymemberx{unordered_multiset}{#1}%
 \indexlibrarymemberx{unordered_multimap}{#1}%
+\indexlibrarymemberx{flat_map}{#1}%
+\indexlibrarymemberx{flat_set}{#1}%
+\indexlibrarymemberx{flat_multiset}{#1}%
+\indexlibrarymemberx{flat_multimap}{#1}%
 }
 
 \pnum
@@ -879,6 +887,25 @@
 }
 
 \indexcont{operator<=>}%
+\indexlibrarymember{array}{operator<=>}%
+\indexlibrarymember{deque}{operator<=>}%
+\indexlibrarymember{forward_list}{operator<=>}%
+\indexlibrarymember{list}{operator<=>}%
+\indexlibrarymember{vector}{operator<=>}%
+\indexlibrarymember{map}{operator<=>}%
+\indexlibrarymember{set}{operator<=>}%
+\indexlibrarymember{multiset}{operator<=>}%
+\indexlibrarymember{multimap}{operator<=>}%
+\indexlibrarymember{unordered_map}{operator<=>}%
+\indexlibrarymember{unordered_set}{operator<=>}%
+\indexlibrarymember{unordered_multiset}{operator<=>}%
+\indexlibrarymember{unordered_multimap}{operator<=>}%
+\indexlibrarymember{flat_map}{operator<=>}%
+\indexlibrarymember{flat_set}{operator<=>}%
+\indexlibrarymember{flat_multiset}{operator<=>}%
+\indexlibrarymember{flat_multimap}{operator<=>}%
+\indexlibrarymember{basic_string}{operator<=>}%
+
 \begin{itemdecl}
 a <=> b
 \end{itemdecl}
@@ -2747,6 +2774,10 @@
 \indexlibrary{\idxcode{map}!\idxcode{#1}}%
 \indexlibrary{\idxcode{multiset}!\idxcode{#1}}%
 \indexlibrary{\idxcode{multimap}!\idxcode{#1}}%
+\indexlibrary{\idxcode{flat_set}!\idxcode{#1}}%
+\indexlibrary{\idxcode{flat_map}!\idxcode{#1}}%
+\indexlibrary{\idxcode{flat_multiset}!\idxcode{#1}}%
+\indexlibrary{\idxcode{flat_multimap}!\idxcode{#1}}%
 }
 
 \indexordmem{key_type}%