doc: Updated Matter factory provisioning guide

Added information that clarifies several sections in the Matter
factory provisioning guide.

Signed-off-by: Kamil Kasperczyk <[email protected]>

Author: kkasperczyk-no

doc/nrf/links.txt

@@ -1307,7 +1307,7 @@
 .. _`CBOR Object Signing and Encryption (COSE)`: https://datatracker.ietf.org/doc/html/rfc8152
 .. _`CBOR Object Signing and Encryption (COSE): Structures and Process`: https://datatracker.ietf.org/doc/html/rfc9052
 
-.. _`SPAKE2+`: https://datatracker.ietf.org/doc/pdf/draft-bar-cfrg-spake2plus-02.pdf
+.. _`SPAKE2+`: https://datatracker.ietf.org/doc/rfc9383/
 
 .. _`DULT`: https://datatracker.ietf.org/doc/draft-detecting-unwanted-location-trackers/
 .. _`DULT status`: https://www.ietf.org/archive/id/draft-detecting-unwanted-location-trackers-01.html#name-status-of-this-memo