fix(manuscript): note how to retain latexdiff log

Signed-off-by: Cameron Smith <cameron.ray.smith@gmail.com>

Author: cameronraysmith

reproducibility/manuscript/Makefile

@@ -108,6 +108,7 @@ cache-tex: copy-tex
 # run as make latexdiff COMPARISON_SHA1="commit-hash"
 # to diff with a different commit
 # see: https://gitlab.com/git-latexdiff/git-latexdiff
+# Set `--cleanup none` to keep the tmp files including the latex log
 latexdiff:
 	git-latexdiff \
 	--ignore-latex-errors \
@@ -117,7 +118,6 @@ latexdiff:
 	--no-view \
 	--ignore-makefile \
 	--ln-untracked \
-	--cleanup none \
 	--output $(TEX_FILE)-$(COMPARISON_SHA1)-diff.pdf \
 	--main $(TEX_FILE).tex $(COMPARISON_SHA1) HEAD