[memory.syn, unique.ptr] Add explanatory comments to make_unique overloads similar to the ones for make_shared, and mild presentational cleanup

Author: tkoeppe

source/utilities.tex

@@ -6662,9 +6662,12 @@
   template <class T, class D = default_delete<T>> class unique_ptr;
   template <class T, class D> class unique_ptr<T[], D>;
 
-  template <class T, class... Args> unique_ptr<T> make_unique(Args&&... args);
-  template <class T> unique_ptr<T> make_unique(size_t n);
-  template <class T, class... Args> @\unspec@ make_unique(Args&&...) = delete;
+  template <class T, class... Args> unique_ptr<T>
+    make_unique(Args&&... args);                                                // \tcode{T} is not array
+  template <class T> unique_ptr<T>
+    make_unique(size_t n);                                                      // \tcode{T} is \tcode{U[]}
+  template <class T, class... Args>
+    @\unspecnc@ make_unique(Args&&...) = delete;                                // \tcode{T} is \tcode{U[N]}
 
   template <class T, class D>
     void swap(unique_ptr<T, D>& x, unique_ptr<T, D>& y) noexcept;
@@ -8119,7 +8122,8 @@
 
     // \ref{unique.ptr.single.asgn}, assignment
     unique_ptr& operator=(unique_ptr&& u) noexcept;
-    template <class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
+    template <class U, class E>
+      unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
     unique_ptr& operator=(nullptr_t) noexcept;
 
     // \ref{unique.ptr.single.observers}, observers
@@ -8705,8 +8709,7 @@
 
 \indexlibrary{\idxcode{unique_ptr}!constructor}%
 \begin{itemdecl}
-template <class U, class E>
-  unique_ptr(unique_ptr<U, E>&& u) noexcept;
+template <class U, class E> unique_ptr(unique_ptr<U, E>&& u) noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -8734,8 +8737,7 @@
 
 \indexlibrarymember{operator=}{unique_ptr}%
 \begin{itemdecl}
-template <class U, class E>
-  unique_ptr& operator=(unique_ptr<U, E>&& u)noexcept;
+template <class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u)noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}