cmd/go: document which vet tests are enabled during go test

Update #18085
Fixes #24009

Change-Id: I655ad76284480002f8d49da269be92ded306128b
Reviewed-on: https://go-review.googlesource.com/107077Reviewed-by: Rob Pike <r@golang.org>

src/cmd/go/alldocs.go

@@ -755,9 +755,12 @@
 //
 // As part of building a test binary, go test runs go vet on the package
 // and its test source files to identify significant problems. If go vet
-// finds any problems, go test reports those and does not run the test binary.
-// Only a high-confidence subset of the default go vet checks are used.
-// To disable the running of go vet, use the -vet=off flag.
+// finds any problems, go test reports those and does not run the test
+// binary. Only a high-confidence subset of the default go vet checks are
+// used. That subset is: 'atomic', 'bool', 'buildtags', 'nilfunc', and
+// 'printf'. You can see the documentation for these and other vet tests
+// via "go doc cmd/vet". To disable the running of go vet, use the
+// -vet=off flag.
 //
 // All test output and summary lines are printed to the go command's
 // standard output, even if the test printed them to its own standard

src/cmd/go/internal/test/test.go

@@ -76,9 +76,12 @@ to hold ancillary data needed by the tests.
 
 As part of building a test binary, go test runs go vet on the package
 and its test source files to identify significant problems. If go vet
-finds any problems, go test reports those and does not run the test binary.
-Only a high-confidence subset of the default go vet checks are used.
-To disable the running of go vet, use the -vet=off flag.
+finds any problems, go test reports those and does not run the test
+binary. Only a high-confidence subset of the default go vet checks are
+used. That subset is: 'atomic', 'bool', 'buildtags', 'nilfunc', and
+'printf'. You can see the documentation for these and other vet tests
+via "go doc cmd/vet". To disable the running of go vet, use the
+-vet=off flag.
 
 All test output and summary lines are printed to the go command's
 standard output, even if the test printed them to its own standard