A nurse appears to have borrowed your scissors to fettle a troublesome patient/doctor/secretary of state for health and social care.
As for RFCs, they're the documents "Request For Comments" that define the standards that make the Internet work. Most of them are boring protocol specs, but 1855 is more like a combination of a style guide and best practice guideline. It's one of the ones that provides guidance on how to write messages for optimal clarity, readability, compatibility, and without wasting too much bandwidth (back in the days when a few kilobytes here and there added up to real money in network/storage costs) - the sort of thing that went straight out the window when Microsoft came along and made Outlook (which breaks most of this stuff) the de-facto standard for business (and for a time, home) email users.
There's a tradition of joke RFCs being published on April 1st. RFC1149 "IP over Avian Carriers" is probably the most famous, it being a protocol specification for implementing an internet connection over carrier pigeons. It's useless, but it's amusingly compelling enough that it's been tested and it does actually work.
"n00b" is gamer-speak for "newbie", a common term from the heyday of Usenet and BBSes for someone who had yet to learn the technical and cultural aspects of harmonious online socialisation. It's not inherently derogatory, but does get used as a slur against people who ought to know better when indulging in newbie-like behaviour (bad quoting, me-tooing, asking questions that have already been answered, that sort of thing), and is occasionally used self-deprecatingly as a statement of ignorance in a given field.
I don't think anyone on here qualifies as illiterate, but if you've ever had email dialogue with a Mistake Agent or similar, you'll have an idea of what I meant by "illiterate n00bs who wouldn't know RFC1855 if an avian carrier dropped it on their head". Sort of people who quote your entire email (even though they've only read the first paragraph) then add a single line at the top to "advice" you of something, usually in HTML and with broken references and sig separators. That this is now how email is normally used, and that my ramblings about nettiquette seem hopelessly dated is clearly a sign of being middle-aged.