Fix typo (#96058)

diff --git a/packages/flutter_tools/templates/app_shared/web/index.html.tmpl b/packages/flutter_tools/templates/app_shared/web/index.html.tmpl
index 850aa31..725f53d 100644
--- a/packages/flutter_tools/templates/app_shared/web/index.html.tmpl
+++ b/packages/flutter_tools/templates/app_shared/web/index.html.tmpl
@@ -85,7 +85,7 @@
           });
 
         // If service worker doesn't succeed in a reasonable amount of time,
-        // fallback to plaint <script> tag.
+        // fallback to plain <script> tag.
         setTimeout(() => {
           if (!scriptLoaded) {
             console.warn(