Fix broken link

README.md

@@ -77,7 +77,7 @@ Produces the following event:
 ### fluent-plugin-datadog properties
 Let's go deeper on the plugin configuration.
 
-As fluent-plugin-datadog is an output_buffer, you can set all output_buffer properties like it's describe in the [fluentd documentation](http://docs.fluentd.org/articles/output-plugin-overview#buffered-output-parameters "documentation").
+As fluent-plugin-datadog is an output_buffer, you can set all output_buffer properties like it's describe in the [fluentd documentation](http://docs.fluentd.org/articles/output-plugin-overview#buffered-output-parameters).
 
 |  Property   |  Description                                                             |  Default value |
 |-------------|--------------------------------------------------------------------------|----------------|