Rename mbedtls_pk_signature_size to mbedtls_pk_get_signature_size
Add more descriptive comments and return value description
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index f7fa4d3..36fdea5 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -475,7 +475,7 @@
*
* \return Maximum size in bytes of a signature made with this key.
*/
-size_t mbedtls_pk_signature_size( const mbedtls_pk_context *ctx );
+size_t mbedtls_pk_get_signature_size( const mbedtls_pk_context *ctx );
/**
* \brief Decrypt message (including padding if relevant).