RFC 9729 auth48: use short IANA links per style guide

rfc9729.md

@@ -363,7 +363,7 @@ The REQUIRED "s" (signature scheme) Parameter is an integer that specifies the
 signature scheme used to compute the proof transmitted in the `p` Parameter.
 Its value is an integer between 0 and 65535 inclusive from the IANA "TLS
 SignatureScheme" registry maintained at
-<[](https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-signaturescheme)>.
+<[](https://www.iana.org/assignments/tls-parameters)>.
 
 ## The v Parameter {#parameter-v}
 
@@ -595,7 +595,7 @@ Notes:
 
 IANA has registered the following entry in
 the "TLS Exporter Labels" registry maintained at
-<[](https://www.iana.org/assignments/tls-parameters#exporter-labels)>:
+<[](https://www.iana.org/assignments/tls-parameters)>:
 
 Value:
 
@@ -618,7 +618,7 @@ Reference:
 
 IANA has registered the following entry in
 the "Hypertext Transfer Protocol (HTTP) Field Name Registry" maintained at
-<[](https://www.iana.org/assignments/http-fields/http-fields.xhtml)>:
+<[](https://www.iana.org/assignments/http-fields)>:
 
 Field Name: