add 0 limit docs

Author: IVIURRAY

Configurations.md

@@ -1061,7 +1061,7 @@ This option is currently ignored for stdin (`@generated` in stdin is ignored.)
 
 ## `generated_marker_line_search_limit`
 
-Number of lines to check for a `@generated` pragma header when `format_generated_files` is `false`. When `format_generated_files` is `true`, this option has no effect.
+Number of lines to check for a `@generated` pragma header, starting from the top of the file. Setting this value to `0` will treat all files as non-generated. When`format_generated_files` is `true`, this option has no effect.
 
 - **Default value**: `5`
 - **Possible values**: any positive integer