Update website/docs/explanation/glossary_what.md

Use MyST {term} refs

Co-authored-by: Sally <[email protected]>

Author: bruce-esrig

website/docs/explanation/glossary_what.md

@@ -97,7 +97,7 @@ A complex glossary entry is coded as follows:
   ```{glossary}
   GnuTLS_example
    **GNU’s Not Unix Transport Layer Security**.
-   A GNU software package that secures data in transit by implementing the :term:`SSL`, :term:`TLS`, and :term:`DTLS` protocols.
+   A GNU software package that secures data in transit by implementing the {term}`SSL`, {term}`TLS`, and {term}`DTLS` protocols.
 
    Related topic(s): [GnuTLS (Ubuntu Server documentation)](https://documentation.ubuntu.com/server/explanation/crypto/gnutls/#), [GnuTLS (official site)](https://www.gnutls.org/), Cryptography, Web services, OpenLDAP.