Use the new RFC macros wherever RFCs are referenced by number.  No other
changes.
diff --git a/Doc/liburlparse.tex b/Doc/liburlparse.tex
index 9582bbe..651db6d 100644
--- a/Doc/liburlparse.tex
+++ b/Doc/liburlparse.tex
@@ -16,9 +16,8 @@
 
 The module has been designed to match the Internet RFC on Relative
 Uniform Resource Locators (and discovered a bug in an earlier
-draft!).  Refer to RFC 1808\index{RFC!1808} for details on relative
-URLs and RFC 1738\index{RFC!1738} for information on basic URL
-syntax.
+draft!).  Refer to \rfc{1808} for details on relative
+URLs and \rfc{1738} for information on basic URL syntax.
 
 It defines the following functions: