Update documentation

Author: pdimov

doc/assert.adoc

@@ -46,6 +46,9 @@ This is true regardless of whether `NDEBUG` is defined.
 ```
 namespace boost
 {
+#if defined(BOOST_ASSERT_HANDLER_IS_NORETURN)
+    BOOST_NORETURN
+#endif
     void assertion_failed(char const * expr, char const * function,
         char const * file, long line);
 }
@@ -87,6 +90,9 @@ This is true regardless of whether `NDEBUG` is defined.
 ```
 namespace boost
 {
+#if defined(BOOST_ASSERT_HANDLER_IS_NORETURN)
+    BOOST_NORETURN
+#endif
     void assertion_failed_msg(char const * expr, char const * msg,
         char const * function, char const * file, long line);
 }

doc/changes.adoc

@@ -10,6 +10,11 @@ http://www.boost.org/LICENSE_1_0.txt
 :toc-title:
 :idprefix:
 
+## Changes in 1.88.0
+
+* When `BOOST_ASSERT_HANDLER_IS_NORETURN` is defined, `boost::assertion_failed`
+  and `boost::assertion_failed_msg` are declared as `BOOST_NORETURN`.
+
 ## Changes in 1.79.0
 
 * `source_location().file_name()` and `source_location().function_name()`