docs(std.base64): Add references to RFC 4648

There are multiple implementations of Base64, but `std.base64` appears
to be based on RFC 4648, so we clarify that it is based on RFC 4648.
677b2d62e5Shun Sakai committed on 3/24/2025, 11:42:28 AM· committed by Linus Grohparentdfe0fb6
1 file changedLine totals unavailable