Complete the omitted sentence

Signed-off-by: Vanio Begic <[email protected]>

Author: thecooldrop

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/testing/testcontainers.adoc

@@ -13,7 +13,7 @@ In following sections we will describe some of the methods you can use to integr
 == Using via @Testcontainers JUnit5 extension
 
 The Testcontainers provides JUnit5 extensions, which can be used to manage containers in your tests.
-The extension is activated by applying the
+The extension is activated by applying the `@Testcontainers` annotation from Testcontainers to your test class.
 
 Testcontainers can be used in a Spring Boot test as follows: