Adding correction to documentation

As picked up in review, this commit
modifies the documentation by removing some
wording that is now superfluous given the
removal of the mode parameter.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
diff --git a/include/mbedtls/rsa.h b/include/mbedtls/rsa.h
index a4ef488..a54ac4d 100644
--- a/include/mbedtls/rsa.h
+++ b/include/mbedtls/rsa.h
@@ -714,11 +714,6 @@
  *                 hold the decryption of the particular ciphertext provided,
  *                 the function returns \c MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
  *
- *
- * \note           Alternative implementations of RSA need not support
- *                 mode being set to #MBEDTLS_RSA_PUBLIC and might instead
- *                 return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
- *
  * \param ctx      The initialized RSA context to use.
  * \param f_rng    The RNG function. This is used for blinding and should
  *                 be provided; see mbedtls_rsa_private() for more.
@@ -755,10 +750,6 @@
  *                 hold the decryption of the particular ciphertext provided,
  *                 the function returns #MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
  *
- * \note           Alternative implementations of RSA need not support
- *                 mode being set to #MBEDTLS_RSA_PUBLIC and might instead
- *                 return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
- *
  * \param ctx      The initialized RSA context to use.
  * \param f_rng    The RNG function. This is used for blinding and should
  *                 be provided; see mbedtls_rsa_private() for more.
@@ -797,10 +788,6 @@
  *                   ciphertext provided, the function returns
  *                   #MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
  *
- * \note             Alternative implementations of RSA need not support
- *                   mode being set to #MBEDTLS_RSA_PUBLIC and might instead
- *                   return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
- *
  * \param ctx        The initialized RSA context to use.
  * \param f_rng      The RNG function. This is used for blinding and should
  *                   be provided; see mbedtls_rsa_private() for more.