Update assessment.md - `spark.catalog.x` guidance needed updating

[dmoore247]

The recent release of DBR 14+ make spark.catalog.x functions 'safe' to run on shared compute so updating guidance.

Changes

Update assessment readme, updating user guidance for shared compute fixes to spark.catalog.* functions

Functionality

• [x] added relevant user documentation
• [ ] added new CLI command
• [ ] modified existing command: databricks labs ucx ...
• [ ] added a new workflow
• [ ] modified existing workflow: ...
• [ ] added a new table
• [ ] modified existing table: ...

Tests

• [x] manually tested
• [ ] added unit tests
• [ ] added integration tests
• [ ] verified on staging environment (screenshot attached)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.22%. Comparing base (a42a83b) to head (54c4ef3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1708   +/-   ##
=======================================
  Coverage   89.22%   89.22%           
=======================================
  Files          88       88           
  Lines       11127    11127           
  Branches     1959     1959           
=======================================
  Hits         9928     9928           
  Misses        821      821           
  Partials      378      378           

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[github-actions[bot]]

✅ 167/167 passed, 25 skipped, 3h46m41s total

_{Running from acceptance #3260}