Fix typos/style in doxygen documentation
diff --git a/include/mbedtls/memory_buffer_alloc.h b/include/mbedtls/memory_buffer_alloc.h
index 3408f34..5e14823 100644
--- a/include/mbedtls/memory_buffer_alloc.h
+++ b/include/mbedtls/memory_buffer_alloc.h
@@ -127,7 +127,7 @@
  *          is defined. (Includes stack trace information for each block if
  *          MBEDTLS_MEMORY_BACKTRACE is defined as well).
  *
- * \returns             0 if verified, 1 otherwise
+ * \return             0 if verified, 1 otherwise
  */
 int mbedtls_memory_buffer_alloc_verify( void );