Update expected.md

doc/expected.md

@@ -102,12 +102,12 @@
         unexpected_<E...> unexpected() const;
 
         template<class E2> constexpr E2 error() const noexcept;
-        constexpr mp_first<expected> error() const noexcept;
+        constexpr /*see below*/ error() const noexcept;
 
         // error mapping
 
         template<class F> /*see below*/ remap_errors( F&& f ) const;
-        expected<T, std::error_code> remap_errors();
+        expected<T, std::error_code> remap_errors() const;
 
         // then
 
@@ -123,13 +123,13 @@
     template<class T, class... E>
     inline void swap( expected<T, E...>& x1, expected<T, E...>& x2 ) noexcept( /*see below*/ );
 
-    } // namespace variant2
-    } // namespace boost
-
     // is_expected
 
     template<class T> struct is_expected;
 
+    } // namespace variant2
+    } // namespace boost
+
 ## Reference
 
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