Clarification on the the term CRUD methods in reference documentation.

Fixes #2792.

Author: odrotbohm

src/main/asciidoc/repositories.adoc

@@ -21,7 +21,7 @@ For detailed information on the specific features of your module, see the chapte
 == Core concepts
 
 The central interface in the Spring Data repository abstraction is `Repository`.
-It takes the domain class to manage as well as the ID type of the domain class as type arguments.
+It takes the domain class to manage as well as the identifier type of the domain class as type arguments.
 This interface acts primarily as a marker interface to capture the types to work with and to help you to discover interfaces that extend this one.
 The https://docs.spring.io/spring-data/commons/docs/current/api/org/springframework/data/repository/CrudRepository.html[`CrudRepository`] interface provides sophisticated CRUD functionality for the entity class that is being managed.
 
@@ -55,6 +55,8 @@ public interface CrudRepository<T, ID> extends Repository<T, ID> {
 <6> Indicates whether an entity with the given ID exists.
 ====
 
+The methods declared in this interface are commonly referred to as CRUD methods.
+
 NOTE: We also provide persistence technology-specific abstractions, such as `JpaRepository` or `MongoRepository`.
 Those interfaces extend `CrudRepository` and expose the capabilities of the underlying persistence technology in addition to the rather generic persistence technology-agnostic interfaces such as `CrudRepository`.