Fixed nested namespace comment

src/namespaces.cpp

@@ -31,7 +31,7 @@ namespace ABC {
   // ABC. The syntax for declaring a nested namespace is identical to the syntax of
   // declaring a non-nested namespace.
   namespace DEF {
-    // We define a function bar inside the N::M namespace.
+    // We define a function bar inside the ABC::DEF namespace.
     void bar(float a) {
       std::cout << "Hello from ABC::DEF::bar: " << a << std::endl;
     }
@@ -46,18 +46,16 @@ namespace ABC {
     }
 
     // We define a function uses_spam in the ABC::DEF namespace. To refer to 
-    // ABC::spam from the ABC::DEF namespace, we have no other option but to
-    // refer to it by its full identifier. Attempting to refer to it by spam
-    // will result in a compilation error, stating that no function called spam
-    // or ABC::DEF::spam exists. Note that it is possible to refer to every
-    // function by its full identifier, but doing this makes coding speed 
-    // inefficient.
+    // ABC::spam from the ABC::DEF namespace, we can use spam(a). There is 
+    // documentation governing the unqualified name lookup order on:
+    // https://en.cppreference.com/w/cpp/language/unqualified_lookup
+    // Note that it is possible to refer to every function by its full identifier, 
+    // but doing this makes coding speed inefficient.
     void uses_spam(int a) {
       std::cout << "Hello from uses_spam: ";
       ABC::spam(a);
 
-      // Try uncommenting this code, which calls spam(a), here.
-      // spam(a);
+      spam(a);
     }
   }