upgrade.py: update file comment, add a note to not forget this anymore
upgrade.py: update file comment, add a note to not forget this anymore

umarfarook882/owasp-modsecurity-crs,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,umarfarook882/owasp-modsecurity-crs,coreruleset/coreruleset,umarfarook882/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,umarfarook882/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,umarfarook882/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs