Fix bad grammar in declarative documentation (#10236)

* Fix bad grammar in declarative documentation

* Fix typos

documentation/application/application-declarative.asciidoc

@@ -26,7 +26,7 @@ vertical.addComponent(new TextField("Postal code"));
 layout.addComponent(vertical);
 ----
 
-You could define it declaractively with the following equivalent design:
+You could define it declaratively with the following equivalent design:
 
 [source, html]
 ----
@@ -325,9 +325,7 @@ HTML file, which can be bound to a class extending [classname]#VerticalLayout#.
 [[application.declarative.composite.using]]
 === Using a Design
 
-The fact that a component is defined declaratively is not visible in its API, so
-you can create and use such it just like any other component.
-
+You can create and use a declaratively defined component just like any other component.
 For example, to use the previously defined design root component as the content
 of the entire UI: