[meta.reflection.substitute] Name correct function in comments (#8372)

Author: Ukilele

source/meta.tex

@@ -6067,16 +6067,16 @@
   auto fn1();
 
 static_assert(!can_substitute(^^fn1, {^^int}));         // OK
-constexpr info r1 = substitute(^^fn1, {^^int});         // error: \tcode{fn<int>} contains an undeduced
+constexpr info r1 = substitute(^^fn1, {^^int});         // error: \tcode{fn1<int>} contains an undeduced
                                                         // placeholder type for its return type
 
 template<class T>
   auto fn2() {
-    static_assert(^^T != ^^int);    // static assertion failed during instantiation of \tcode{fn<int>}
+    static_assert(^^T != ^^int);    // static assertion failed during instantiation of \tcode{fn2<int>}
     return 0;
   }
 
-constexpr bool r2 = can_substitute(^^fn2, {^^int});     // error: instantiation of body of \tcode{fn<int>}
+constexpr bool r2 = can_substitute(^^fn2, {^^int});     // error: instantiation of body of \tcode{fn2<int>}
                                                         // is needed to deduce return type
 \end{codeblock}
 \end{example}