fix: typo in comment

Makefile

@@ -119,7 +119,7 @@ search/for/zip:
 	@command -v zip || { echo "not found"; exit 1; }
 
 #help:
-#help: The `make docs clean` commanfd build the docs for docs.ooni.org.
+#help: The `make docs clean` command builds the docs for docs.ooni.org.
 .PHONY: docs clean
 docs:
 	./scripts/build_docs.sh