Update for Rails 7.2: public/robots.txt (Cosmetic Change)

Author: yasulab

public/robots.txt

@@ -1,6 +1,4 @@
-# See http://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file
-#
-# To ban all spiders from the entire site uncomment the next two lines:
+# See https://www.robotstxt.org/robotstxt.html for documentation on how to use the robots.txt file
 User-agent: *
 Disallow: /stretch3
 Disallow: /calendar/*