chore(docs): update DASHBOARD_RBAC

[amitmiran137]

SUMMARY

At Nielsen , we have been using that feature for about 2 months now.
we setup a specific role for every dashboard and associate users to the relevant dashboard to get read access to the dashboard and the data in the charts with zero issues so far

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

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 #15514 (8b797fe) into master (7f2f51b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #15514   +/-   ##
=======================================
  Coverage   77.24%   77.24%           
=======================================
  Files         975      975           
  Lines       50866    50866           
  Branches     6740     6740           
=======================================
  Hits        39293    39293           
  Misses      11357    11357           
  Partials      216      216           

Flag	Coverage Δ
hive	81.38% <ø> (ø)
javascript	71.86% <ø> (ø)
mysql	81.64% <ø> (ø)
postgres	81.66% <ø> (ø)
presto	81.37% <ø> (ø)
python	82.19% <ø> (ø)
sqlite	81.28% <ø> (ø)

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[fintzd]

looks good to me !