tool/web: tiniest tweak to wasm help content (#126284)

Missing "tick"

packages/flutter_tools/lib/src/web/compiler_config.dart

@@ -200,7 +200,7 @@ enum WasmOptLevel implements CliEnum {
   @override
   String get helpText => switch(this) {
     WasmOptLevel.none => 'wasm-opt is not run. Fastest build; bigger, slower output.',
-    WasmOptLevel.debug => 'Similar to `${WasmOptLevel.full.name}, but member names are preserved. Debugging is easier, but size is a bit bigger.',
+    WasmOptLevel.debug => 'Similar to `${WasmOptLevel.full.name}`, but member names are preserved. Debugging is easier, but size is a bit bigger.',
     WasmOptLevel.full => 'wasm-opt is run. Build time is slower, but output is smaller and faster.',
   };
 }