docs: remove references to DHE-RSA

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/docs/architecture/tls13-support.md b/docs/architecture/tls13-support.md
index c98ccf7..aa09e30 100644
--- a/docs/architecture/tls13-support.md
+++ b/docs/architecture/tls13-support.md
@@ -117,7 +117,6 @@
   | MBEDTLS_KEY_EXCHANGE_PSK_ENABLED         | n/a (2) |
   | MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED   | n/a     |
   | MBEDTLS_KEY_EXCHANGE_RSA_ENABLED         | n/a     |
-  | MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED     | n/a     |
   | MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED   | n/a     |
   | MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED | n/a     |
   | MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED  | n/a     |