[docs] Updating slice parameter documentation.

[john-bodley]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Updating the documentation around slice parameters in reference to which fields columns and metrics can be defined in.

TEST PLAN

N/A.

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

to: @etr2460 @michellethomas

[codecov-io]

Codecov Report

Merging #8535 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8535   +/-   ##
=======================================
  Coverage   66.72%   66.72%           
=======================================
  Files         449      449           
  Lines       22696    22696           
  Branches     2366     2366           
=======================================
  Hits        15143    15143           
  Misses       7415     7415           
  Partials      138      138

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