Dotty

Documentation only: update Example code linked to obsolete content in macros-spec.md #33698

Job	Run time
test_non_bootstrapped	0s
test	52m 16s
test_scala2_library_tasty	0s
test_windows_fast	32m 19s
community_build_a	48m 35s
MiMa	11m 39s
test_windows_full	0s
community_build_b	1h 17m 11s
community_build_c	1h 2m 25s
test_sbt	19m 14s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 37s
test-msi-package	0s
build-chocolatey-package / build	19s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 11m 35s

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