[skip ci] Updating the plugin doc

Author: ph

docs/index.asciidoc

@@ -7,7 +7,7 @@ START - GENERATED VARIABLES, DO NOT EDIT!
 :version: %VERSION%
 :release_date: %RELEASE_DATE%
 :changelog_url: %CHANGELOG_URL%
-:include_path: ../../../logstash/docs/include
+:include_path: ../../../../logstash/docs/include
 ///////////////////////////////////////////
 END - GENERATED VARIABLES, DO NOT EDIT!
 ///////////////////////////////////////////
@@ -25,7 +25,7 @@ include::{include_path}/plugin_header.asciidoc[]
 [id="plugins-{type}s-{plugin}-options"]
 ==== Http Output Configuration Options
 
-This plugin supports the following configuration options plus the <<plugins-{type}s-common-options>> described later.
+This plugin supports the following configuration options plus the <<plugins-{type}s-{plugin}-common-options>> described later.
 
 [cols="<,<,<",options="header",]
 |=======================================================================
@@ -64,7 +64,7 @@ This plugin supports the following configuration options plus the <<plugins-{typ
 | <<plugins-{type}s-{plugin}-validate_after_inactivity>> |<<number,number>>|No
 |=======================================================================
 
-Also see <<plugins-{type}s-common-options>> for a list of options supported by all
+Also see <<plugins-{type}s-{plugin}-common-options>> for a list of options supported by all
 output plugins.
 
 &nbsp;
@@ -377,4 +377,5 @@ See https://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache
 
 
 
-include::{include_path}/{type}.asciidoc[]
+[id="plugins-{type}s-{plugin}-common-options"]
+include::{include_path}/{type}.asciidoc[]