[template.bitset.general][vector.bool.pspc] Reorder reference members

Reorder the members of `reference` classes to be consistent with each other
and elsewhere.  First list constructors, destructor, and assignment operator.
Then list accessors, and finally modifiers. Keep unary `operator~` adjacent
to `flip` where both are present.

Author: AlisdairM

source/containers.tex

@@ -10482,10 +10482,10 @@
     public:
       constexpr reference(const reference& x) noexcept;
       constexpr ~reference();
-      constexpr operator bool() const noexcept;
       constexpr reference& operator=(bool x) noexcept;
       constexpr reference& operator=(const reference& x) noexcept;
       constexpr const reference& operator=(bool x) const noexcept;
+      constexpr operator bool() const noexcept;
       constexpr void flip() noexcept;   // flips the bit
 
       friend constexpr void swap(reference x, reference y) noexcept;

source/utilities.tex

@@ -10414,8 +10414,8 @@
       constexpr reference& operator=(bool x) noexcept;              // for \tcode{b[i] = x;}
       constexpr reference& operator=(const reference& x) noexcept;  // for \tcode{b[i] = b[j];}
       constexpr const reference& operator=(bool x) const noexcept;
-      constexpr bool operator~() const noexcept;                    // flips the bit
       constexpr operator bool() const noexcept;                     // for \tcode{x = b[i];}
+      constexpr bool operator~() const noexcept;                    // flips the bit
       constexpr reference& flip() noexcept;                         // for \tcode{b[i].flip();}
 
       friend constexpr void swap(reference x, reference y) noexcept;