[Umbrella][Doc] Datasource Connector documentation improvement

[yaooqinn]

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

Search before asking

• [X] I have searched in the issues and found no similar issues.

Describe the proposal

This section describes the connectors available for different kyuubi engines to access data from various data sources.

User Documentation Writing Principles:

• General ones http://www.cypressmedia.net/articles/article/26/six_principles_of_technical_writing
• Using markdown or reStructuredText(recommended)
• More about how users or developers shall use an API, feature etc, less about what it is.

Task list

• Connectors #3060

• Connectors for Spark SQL Query Engine

  • Delta Lake
  • Delta Lake with Microsoft Azure Blob Storage
  • #3067
  • #3068
  • #3069
  • Kudu
  • #3154
  • #3211
  • #3228
  • ** Add more connectors if missing **

• Connectors For Flink SQL Query Engine

  • #3070
  • #3071
  • #3072

• Connectors For Hive SQL Query Engine

  • #3083
  • #3084
  • #3085

• Connectors For Trino SQL Query Engine

  • #3080
  • #3081
  • #3082

Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!