doc: fix typo in updating-objects-in-state.md (#7077)

Author: Rekl0w

src/content/learn/updating-objects-in-state.md

@@ -379,7 +379,7 @@ Note that the `...` spread syntax is "shallow"--it only copies things one level
 
 #### Using a single event handler for multiple fields {/*using-a-single-event-handler-for-multiple-fields*/}
 
-You can also use the `[` and `]` braces inside your object definition to specify a property with dynamic name. Here is the same example, but with a single event handler instead of three different ones:
+You can also use the `[` and `]` braces inside your object definition to specify a property with a dynamic name. Here is the same example, but with a single event handler instead of three different ones:
 
 <Sandpack>