Use the new RFC macros wherever RFCs are referenced by number. No other
changes.
diff --git a/Doc/libhttplib.tex b/Doc/libhttplib.tex
index 5b2cf85..0bca8ad 100644
--- a/Doc/libhttplib.tex
+++ b/Doc/libhttplib.tex
@@ -79,7 +79,7 @@
\end{funcdesc}
\begin{funcdesc}{putheader}{header\, argument\optional{\, ...}}
-Send an RFC-822 style header to the server. It sends a line to the
+Send an \rfc{822} style header to the server. It sends a line to the
server consisting of the header, a colon and a space, and the first
argument. If more arguments are given, continuation lines are sent,
each consisting of a tab and an argument.