Update src/expressions.md

nikomatsakis · F001 · web-flow · commit 03d8020d6d5b · 2019-08-16T10:01:58.000-04:00
Co-Authored-By: F001 &lt;changchun.fan@qq.com&gt;
diff --git a/src/expressions.md b/src/expressions.md
@@ -13,7 +13,7 @@
 > &nbsp;&nbsp; &nbsp;&nbsp; | [_OperatorExpression_]\
 > &nbsp;&nbsp; &nbsp;&nbsp; | [_GroupedExpression_]\
 > &nbsp;&nbsp; &nbsp;&nbsp; | [_ArrayExpression_]\
-> &nbsp;&nbsp; &nbsp;&nbsp; | [_Awaitxpression_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_AwaitExpression_]\
 > &nbsp;&nbsp; &nbsp;&nbsp; | [_IndexExpression_]\
 > &nbsp;&nbsp; &nbsp;&nbsp; | [_TupleExpression_]\
 > &nbsp;&nbsp; &nbsp;&nbsp; | [_TupleIndexingExpression_]\
