[CAMEL-15916] Add link to the Spring Docs about mongodb client

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: 3.6.0
• Component/s: camel-mongodb

Environment

Ubuntu 20.04

• Estimated Complexity: Novice
• Assignee: Unassigned
• Reporter: Andrii Melashchenko
• Created: 03/Dec/20 11:53
• Updated: 02/Sep/22 17:26
• Resolved: 02/Sep/22 17:26

Description

Docs https://camel.apache.org/components/latest/mongodb-component.html do not have step to add 
```

<repositories> <repository> <id>spring-milestone</id> <name>Spring Maven MILESTONE Repository</name> <url>https://repo.spring.io/libs-milestone</url> </repository></repositories>

```
to pm.file in order to create mongoDB client according to https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#reference
It's better to add direct link to spring to avoid this issue.

Stack-overflow issue https://stackoverflow.com/questions/61313732/configuration-problem-unable-to-locate-spring-namespacehandler-for-xml-schema-n/65125398#65125398

Later I'll add pull request to docs