Fix typos

[choi88andys]

This version may also acceptable.

 runApp(
   Builder(builder: (context) {
     final value = context.watch<Movie?>();

     if (value == null) Text('no Movie found');
     return Text(value.title);
   }),
 );

But I think this version is more self-explanatory.

 runApp(
   Builder(builder: (context) {
     final movie = context.watch<Movie?>();

     if (movie == null) Text('no Movie found');
     return Text(movie.title);
   }),
 );

[changeset-bot]

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Latest commit: 9258f2b

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[rrousselGit]

LGTM thanks!