docs fix makefile shell expansions

make/lib.mk

@@ -15,7 +15,9 @@ DOCS_COLLECT ?= $$(git ls-files '*.c' '*.h')
 DOCS ?= \
 	rm -rf docs; \
 	clang-doc --format=md --output docs -p . $(DOCS_COLLECT); \
-	for f in ./docs/GlobalNamespace/*.md; do sed -i '/^\# Global Namespace/d' "$$f"; done; \
+	for f in ./docs/GlobalNamespace/*.md; \
+		do sed -i '/^\# Global Namespace/d' "$$f"; \
+	done; \
 	rm -rf ../docs/libs/$(libname); \
 	mkdir -p ../docs/libs/$(libname); \
 	cp ./docs/GlobalNamespace/*.md ../docs/libs/$(libname);