docs: add ReplacementTransformer reference #7835

Job	Run time
conditional-changes	5s
check-synced-go-modules	35s
Lint	7m 20s
Test Linux	1m 2s
Test macos-latest - cmd/config	32s
Test ubuntu-latest - cmd/config	59s
Test macos-latest - kyaml	48s
Test macos-latest - kustomize	43s
Test ubuntu-latest - kyaml	59s
Test windows-latest - api	15s
Test windows-latest - kyaml	2m 1s
Test windows-latest - cmd/config	1m 18s
Test windows-latest - kustomize	14s
Test ubuntu-latest - kustomize	11s
Test macos-latest - api	2m 10s
Test ubuntu-latest - api	3m 13s
Test Summary	2s
	22m 27s

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