[indirect, polymorphic] Rename stable lables "asgn" to "assign"

Author: tkoeppe

source/memory.tex

@@ -5865,7 +5865,7 @@
     // \ref{indirect.dtor}, destructor
     constexpr ~indirect();
 
-    // \ref{indirect.asgn}, assignment
+    // \ref{indirect.assign}, assignment
     constexpr indirect& operator=(const indirect& other);
     constexpr indirect& operator=(indirect&& other) noexcept(@\seebelow@);
     template<class U = T>
@@ -6205,7 +6205,7 @@
 then the storage is deallocated.
 \end{itemdescr}
 
-\rSec3[indirect.asgn]{Assignment}
+\rSec3[indirect.assign]{Assignment}
 
 \indexlibrarymember{operator=}{indirect}%
 \begin{itemdecl}
@@ -6723,7 +6723,7 @@
     // \ref{polymorphic.dtor}, destructor
     constexpr ~polymorphic();
 
-    // \ref{polymorphic.asgn}, assignment
+    // \ref{polymorphic.assign}, assignment
     constexpr polymorphic& operator=(const polymorphic& other);
     constexpr polymorphic& operator=(polymorphic&& other) noexcept(@\seebelow@);
 
@@ -7082,7 +7082,7 @@
 then the storage is deallocated.
 \end{itemdescr}
 
-\rSec3[polymorphic.asgn]{Assignment}
+\rSec3[polymorphic.assign]{Assignment}
 
 \indexlibrarymember{operator=}{polymorphic}%
 \indexlibrarydtor{polymorphic}%