fix(Flutter Web App): fixes html lang typo (#151866)

Updates the html tag lang attribute to valid "en-US" according to W3.org.

[Before screenshot](https://screenshot.googleplex.com/CMEvi8nAofR4twf)
[After screenshot](https://screenshot.googleplex.com/5aJZBc6o5Xm9fXH)

Fixes b/338044851

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*List which issues are fixed by this PR. You must list at least one issue. An issue is not required if the PR fixes something trivial like a typo.*

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This commit is contained in:
Joy Serquiña 2024-07-17 10:58:53 -07:00 committed by GitHub
parent 8a0b34c9b9
commit 8a766ce354
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@ -3,7 +3,7 @@
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file. -->
<html lang="en_US">
<html lang="en-US">
<head>
<!--
If you are serving your web app in a path other than the root, change the