driver-only-build: remove paragraph about RSA/DH deterministic key generation

This feature is not supported at all in MbedTLS, driver or not.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/docs/driver-only-builds.md b/docs/driver-only-builds.md
index c2d8f69..373de23 100644
--- a/docs/driver-only-builds.md
+++ b/docs/driver-only-builds.md
@@ -240,10 +240,6 @@
 `[PSA_WANT|MBEDTLS_PSA_ACCEL]_ALG_FFDH` allow builds accelerating FFDH and
 removing builtin support (i.e. `MBEDTLS_DHM_C`).
 
-### Limitations
-Support for deterministic derivation of a DH keypair
-(i.e. `PSA_WANT_KEY_TYPE_RSA_KEY_PAIR_DERIVE`) is not supported.
-
 Ciphers and AEADs
 -----------------