docs: updating usage/managing-tables on optimizing tables

[VillePuuska]

Description

Currently the docs section usage/Managing a table states that

Optimizing tables is not currently supported.

This PR adds a short explanation of optimize and links to the more detailed examples of the usage/Optimize sections.

Related Issue(s)

Closes #2891

Documentation

https://delta-io.github.io/delta-rs/usage/managing-tables/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.40%. Comparing base (c123129) to head (308a5b1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2892   +/-   ##
=======================================
  Coverage   72.40%   72.40%           
=======================================
  Files         133      133           
  Lines       40281    40281           
  Branches    40281    40281           
=======================================
  Hits        29167    29167           
  Misses       9240     9240           
  Partials     1874     1874           

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