build: oops, don't want make comments on the terminal

Makefile

@@ -99,12 +99,12 @@ upgrade: 				## Update the *.pip files with the latest packages satisfying *.in
 	$(PIP_COMPILE) -o requirements/mypy.pip requirements/mypy.in
 
 diff_upgrade:				## Summarize the last `make upgrade`
-	# The sort flags sort by the package name first, then by the -/+, and
-	# sort by version numbers, so we get a summary with lines like this:
-	#	-bashlex==0.16 \
-	#	+bashlex==0.17 \
-	#	-build==0.9.0 \
-	#	+build==0.10.0 \
+	@# The sort flags sort by the package name first, then by the -/+, and
+	@# sort by version numbers, so we get a summary with lines like this:
+	@#	-bashlex==0.16
+	@#	+bashlex==0.17
+	@#	-build==0.9.0
+	@#	+build==0.10.0
 	@git diff -U0 | grep -v '^@' | grep == | sort -k1.2,1.99 -k1.1,1.1r -u -V
 
 ##@ Pre-builds for prepping the code