[zig/en] Remove incorrect comment in enum section (#5061)

* [zig/en] Remove incorrect comment in enum section

Remove a comment in the enum section since it incorrectly says a code
snippet won't compile

* [zig/en] Add comment to enum section

zig.html.markdown

@@ -588,9 +588,7 @@ const x = switch (direction) {
     .South => true,
 };
 
-
-// Switch statements need exhaustiveness.
-// Won't compile: East and West are missing.
+// This compiles without errors, since it exhaustively lists all possible values
 const x = switch (direction) {
     .North => true,
     .South => true,