Dotty

Backport "Documentation only: update Example code linked to obsolete content in macros-spec.md " to 3.3 LTS #307

Job	Run time
test	53m 39s
test_windows_fast	41m 15s
MiMa	3m 58s
community_build_c	1h 8m 34s
community_build_a	56m 37s
test_sbt	17m 40s
community_build_b	1h 22m 25s
build-sdk-package / build	4m 5s
test_windows_full	0s
test_java8	0s
test_non_bootstrapped	0s
build-chocolatey-package / build	17s
test-chocolatey-package	0s
publish_nightly	0s
nightly_documentation	0s
open_issue_on_failure	0s
publish_release	0s
	5h 28m 30s

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