Change bean registration to use initialize
Change bean registration to use initialize

This commit changes the reference documentation to conform
with the updated API defined in
https://github.com/spring-projects/spring-framework/commit/8b8a6766de01467c8b45b1b9664f0ab2d58f7c69

spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework