Added documentation about Fixed and unique domains #5238

Job	Run time
unpack-envvars	1s
flyteadmin integration tests image / build_docker	4m 43s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	4m 24s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	3m 4s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	4m 3s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	6m 4s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	5m 27s
Dry Run Goreleaser	7m 46s
Test Getting started	7m 11s
Lint (datacatalog) / Run Lint	2m 16s
Lint (flyteadmin) / Run Lint	3m 4s
Lint (flytectl) / Run Lint	2m 30s
Lint (flyteidl) / Run Lint	2m 3s
Lint (flyteplugins) / Run Lint	2m 51s
Lint (flytepropeller) / Run Lint	2m 57s
Lint (flytestdlib) / Run Lint	2m 31s
Unit Tests (datacatalog) / Run Unit Test	2m 55s
Unit Tests (flyteadmin) / Run Unit Test	4m 22s
Unit Tests (flytecopilot) / Run Unit Test	2m 33s
Unit Tests (flytectl) / Run Unit Test	3m 18s
Unit Tests (flyteplugins) / Run Unit Test	3m 42s
Unit Tests (flytepropeller) / Run Unit Test	4m 9s
Check Go Generate (datacatalog) / Go Generate	1m 20s
Check Go Generate (flytecopilot) / Go Generate	1m 24s
Check Go Generate (flyteadmin) / Go Generate	2m 6s
Check Go Generate (flytectl) / Go Generate	1m 55s
Check Go Generate (flytepropeller) / Go Generate	2m 7s
Unit Tests (flytestdlib) / Run Unit Test	3m 36s
Integration Test (flyteadmin) / Integration tests	6m 5s
	1h 40m 27s

Provide feedback