Update C++ documentation

Author: simon04

lib/docs/scrapers/cppref/cpp.rb

@@ -3,7 +3,7 @@ class Cpp < Cppref
     self.name = 'C++'
     self.slug = 'cpp'
     self.base_url = 'https://en.cppreference.com/w/cpp/'
-    # release = '2022-09-06'
+    # release = '2023-03-24'
 
     html_filters.insert_before 'cppref/clean_html', 'cpp/entries'