pk: add check_pair info to mbedtls_pk_setup_opaque() documentation
This also updates use-psa-crypto.md accordingly.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index e33702f..a3b1363 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -377,6 +377,9 @@
* In order for the above operations to succeed, the policy of the wrapped PSA
* key must allow the specified algorithm.
*
+ * Opaque PK contexts wrapping an EC keys also support \c mbedtls_pk_check_pair(),
+ * whereas RSA ones do not.
+ *
* \warning The PSA wrapped key must remain valid as long as the wrapping PK
* context is in use, that is at least between the point this function
* is called and the point mbedtls_pk_free() is called on this context.