Added that you can write the RFC number in the search box. Will do so for BCP/STD in the future. Yes, "could not prettify this RFC" is a problem I'm having rig

Added that you can write the RFC number in the search box. Will do so for BCP/STD in the future. Yes, "could not prettify this RFC" is a problem I'm having right now because most sources aren't available. I'm working on obtaining those sources.