docs(UPDATING): Adding downtime for #14234

[john-bodley]

SUMMARY

Adding a missing entry to UPDATING.md associated with #14234 which includes a database migration involving a DDL operation.

@robdiciuccio I wonder if we should update SIP-59 to make sure that all DDL migrations are added to the UPDATING.md since they will likely require downtime for MySQL backed installations.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #14513 (9816a67) into master (52dbe31) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #14513   +/-   ##
=======================================
  Coverage   77.15%   77.15%           
=======================================
  Files         958      958           
  Lines       48241    48241           
  Branches     5636     5636           
=======================================
  Hits        37219    37219           
  Misses      10821    10821           
  Partials      201      201           

Flag	Coverage Δ
hive	80.80% <ø> (ø)
javascript	72.01% <ø> (ø)
mysql	81.06% <ø> (ø)
postgres	81.09% <ø> (ø)
presto	80.79% <ø> (ø)
python	81.63% <ø> (ø)
sqlite	80.70% <ø> (ø)

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