Update 02-Use_the_Tools_Available.md

Update working around /Wall

Author: lefticus

02-Use_the_Tools_Available.md

@@ -161,7 +161,7 @@ Consider using `-Weverything` and disabling the few warnings you need to on Clan
 
 Not recommended
 
- * `/Wall` - Also warns on files included from the standard library, so it's not very useful and creates too many extra warnings.
+ * `/Wall` - Not recommended for normal builds because the MSVC standard library is not `/Wall` "clean", but can be enabled to discover new warnings to enable.
    * Since VS2022, `/external:anglebrackets /external:W0` can be used to turn off warnings from all headers included with angle brackets, e.g. `#include <utility>`.