Update draft-homburg-deleg-incremental-deleg.md

Co-authored-by: Willem Toorop <[email protected]>

draft-homburg-deleg-incremental-deleg.md

@@ -622,7 +622,7 @@ This section will discuss how incremental deleg meets the requirements for a new
   Incremental deleg introduces a new RR type.
   Software that parses zone file format needs to be changed to support the new
   type.
-  Though unknown type notation ({{!RFC3597}}) can be used in some cases if no support for the new Rtype is present.
+  Though unknown type notation {{!RFC3597}} can be used in some cases if no support for the new RR type is present.
   Existing authoritatives can serve incremental deleg-aware zones (though less efficiently), existing signers can sign incremental deleg-aware zones, existing diagnostic tools can query incremental deleg-aware zones.
   Non-recursive DNSSEC validators can operate independently from (possibly legacy) recursive resolvers.