Spell check of Flutter docs (#45200)

No code changes, just comments: I spell-checked all the comments in the repo.
diff --git a/packages/flutter_tools/lib/src/devfs.dart b/packages/flutter_tools/lib/src/devfs.dart
index 9bba2d7..129c09b 100644
--- a/packages/flutter_tools/lib/src/devfs.dart
+++ b/packages/flutter_tools/lib/src/devfs.dart
@@ -534,5 +534,5 @@
   }
 }
 
-/// Converts a platform-specific file path to a platform-independent Uri path.
+/// Converts a platform-specific file path to a platform-independent URL path.
 String _asUriPath(String filePath) => fs.path.toUri(filePath).path + '/';