Mention all required dependencies in LDAP documentation

[Harsh4902]

Expected Behavior

• I think we should mention all the required dependencies in this documentation so it will be more helpfull.

Current Behaviour

• There is no mention of spring-security-ldap dependency in this document, though it is required.

Context

• I was trying to do basic LDAP setup and going through this documentation I added some dependencies, but I was not aware about to add spring-security-ldap. This thing put me in trouble, and then I had to go through some other blogs and videos. So it's my suggestion to add all the required dependencies so it can be easy for users.

[jzheaux]

I agree, @Harsh4902. Would you be able to contribute a PR that adds it to this section? Ideally, please make the change on the 5.8.x branch so we can forward port it after merging.

[Harsh4902]

@jzheaux Sure I will raise a PR for this issue. Give me some time, thank you.

[Harsh4902]

@jzheaux Can I describe required dependencies in Prerequisites section of this document?

[jzheaux]

@Harsh4902, sorry that I missed your message. I think it would be better in https://docs.spring.io/spring-security/reference/servlet/authentication/passwords/ldap.html#servlet-authentication-ldap-embedded or in a new section in between the two. The PreRequisites section seems to be more about architectural groundwork.