Documentation fixes
Fix spacing, comments, and links in doxygen documentation.
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 6bcda17..9e2755f 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -542,7 +542,8 @@
* \param format Point format, should be a MBEDTLS_ECP_PF_XXX macro
* \param p Buffer to write to
* \param size Buffer size
- * \param olen Number of bytes written to \c buf
+ * \param olen Number of bytes written to \c buf on success,
+ * unspecified on failure.
*
* \return 0 on success
* or \c MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL