[Doc] improve doc of materialized view

[murphyatwork]

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Which issues of this PR fixes:

Fixes #

Problem Summary(Required):

1. Fix spelling errors
2. Add DataLake Acceleration as a primary use case
3. Split content into several sections:
   a. Overview
   b. Use Case
   b. Create Materialized View
   c. Query Materialized View
   d. Manage Materialized View

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr will affect users' behaviors
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto backported to target branch
  • 3.0
  • 2.5
  • 2.4
  • 2.3