Add test for deprecated emoji

Author: GuillaumeGomez

src/test/rustdoc/issue-32374.rs

@@ -10,7 +10,7 @@
 // @matches issue_32374/index.html '//*[@class="docblock-short"]/text()' 'Docs'
 
 // @has issue_32374/struct.T.html '//*[@class="stab deprecated"]' \
-//      'Deprecated since 1.0.0: text'
+//      '👎 Deprecated since 1.0.0: text'
 // @has - '<code>test</code>&nbsp;<a href="http://issue_url/32374">#32374</a>'
 // @matches issue_32374/struct.T.html '//*[@class="stab unstable"]' \
 //      '🔬 This is a nightly-only experimental API. \(test\s#32374\)$'
@@ -20,7 +20,7 @@
 pub struct T;
 
 // @has issue_32374/struct.U.html '//*[@class="stab deprecated"]' \
-//      'Deprecated since 1.0.0: deprecated'
+//      '👎 Deprecated since 1.0.0: deprecated'
 // @has issue_32374/struct.U.html '//*[@class="stab unstable"]' \
 //      '🔬 This is a nightly-only experimental API. (test #32374)'
 // @has issue_32374/struct.U.html '//details' \