Misc documentation fixes/improvements.
diff --git a/library/error.c b/library/error.c
index d48ba8f..3345481 100644
--- a/library/error.c
+++ b/library/error.c
@@ -290,7 +290,7 @@
         if( use_ret == -(MBEDTLS_ERR_ECP_HW_ACCEL_FAILED) )
             mbedtls_snprintf( buf, buflen, "ECP - The ECP hardware accelerator failed" );
         if( use_ret == -(MBEDTLS_ERR_ECP_IN_PROGRESS) )
-            mbedtls_snprintf( buf, buflen, "ECP - Operation in progress, try again with the same parameters" );
+            mbedtls_snprintf( buf, buflen, "ECP - Operation in progress, call again with the same parameters to continue" );
 #endif /* MBEDTLS_ECP_C */
 
 #if defined(MBEDTLS_MD_C)