Makes it easier for users who find the file to find its origin.
Fixes https://github.com/curl/curl-www/issues/374
Closes #14465
##
## Certificate data from Mozilla ${datesrc}: ${currentdate} GMT
##
+## Find updated versions here: https://curl.se/docs/caextract.html
+##
## This is a bundle of X.509 certificates of public Certificate Authorities
## (CA). These were automatically extracted from Mozilla's root certificates
## file (certdata.txt). This file can be found in the mozilla source tree: