Fix typo and add performance generated files to make clean

Author: tcornell-bus

Makefile

@@ -393,6 +393,7 @@ clean:  ## Remove all temporary files, packaging artifacts and docs
 	rm -f .coverage tags
 	rm -rf examples/convert/{main.fmf,test.md,Manual} Manual
 	rm -f tests/full/repo_copy.tgz
+	rm -rf .profile_common_commands .profile_synthetic_runs tests/performance/synthetic
 
 clean/images:  ## Remove tmt images
 	for image in $(TMT_DISTRO_CONTAINER_IMAGES); do \

tests/performance/templates/plan.fmf.j2

@@ -7,6 +7,6 @@ execute:
     summary: Synthetic true performance plan
 
 /write:
-    summary: Synthetic write performance test
+    summary: Synthetic write performance plan
     context:
         type: write