tests/Makefile: Fix check-report.* targets shown in check-help

The check-report.html and check-report.xml targets were replaced
with check-report.tap in commit 9df43317b8 but the check-help
text was not updated so it still lists check-report.html.

Fixes: 9df43317b8
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20191211204427.4681-2-wainersm@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/Makefile.include

@@ -16,12 +16,10 @@ check-help:
 	@echo " $(MAKE) check-softfloat      Run FPU emulation tests"
 	@echo " $(MAKE) check-acceptance     Run all acceptance (functional) tests"
 	@echo
-	@echo " $(MAKE) check-report.html    Generates an HTML test report"
+	@echo " $(MAKE) check-report.tap     Generates an aggregated TAP test report"
 	@echo " $(MAKE) check-venv           Creates a Python venv for tests"
 	@echo " $(MAKE) check-clean          Clean the tests and related data"
 	@echo
-	@echo "Please note that HTML reports do not regenerate if the unit tests"
-	@echo "have not changed."
 	@echo
 	@echo "The variable SPEED can be set to control the gtester speed setting."
 	@echo "Default options are -k and (for $(MAKE) V=1) --verbose; they can be"