[skip ci] Updating the plugin id in the doc to match the index in the docbook

ph · ph · commit a599077985fa · 2017-06-26T21:24:09.000-04:00
diff --git a/docs/index.asciidoc b/docs/index.asciidoc
@@ -12,7 +12,7 @@ START - GENERATED VARIABLES, DO NOT EDIT!
 END - GENERATED VARIABLES, DO NOT EDIT!
 ///////////////////////////////////////////
 
-[id="plugins-{type}-{plugin}"]
+[id="plugins-{type}s-{plugin}"]
 
 === Grok filter plugin
 
