Update app-builder.mdx

Author: Bilogweb3

src/pages/cw-multi-test/app-builder.mdx

@@ -48,7 +48,7 @@ The simplest way to create a chain using [`AppBuilder{:rust}`][AppBuilder] is by
 `default{:rust}` method. Since [`AppBuilder{:rust}`][AppBuilder] follows the principles of the
 builder pattern, you need to finalize the building process by calling the [`build{:rust}`][build]
 method with a chain initialization callback function. When no specific chain initialization is
-required you can just use provided [`no_init`](app#no_init) callback. In the following code example,
+required you can just use the provided [`no_init`](app#no_init) callback. In the following code example,
 the chain is created with default settings as described in
 [Features summary](features#features-summary).