[varnish] add @see comment to deprecated constants

Author: gquintard

app/code/Magento/PageCache/Model/Config.php

@@ -58,12 +58,14 @@ class Config
 
     /**
      * @deprecated Varnish 5 is EOL
+     * @see VARNISH_6_CONFIGURATION_PATH
      * XML path to Varnish 5 config template path
      */
     public const VARNISH_5_CONFIGURATION_PATH = 'system/full_page_cache/varnish5/path';
 
     /**
      * @deprecated Varnish 4 is EOL
+     * @see VARNISH_6_CONFIGURATION_PATH
      * XML path to Varnish 4 config template path
      */
     public const VARNISH_4_CONFIGURATION_PATH = 'system/full_page_cache/varnish4/path';

app/code/Magento/PageCache/Model/Varnish/VclTemplateLocator.php

@@ -25,28 +25,33 @@ class VclTemplateLocator implements VclTemplateLocatorInterface
 
     /**
      * @deprecated Varnish 5 is EOL
+     * @see VARNISH_6_CONFIGURATION_PATH
      * XML path to Varnish 5 config template path
      */
     const VARNISH_5_CONFIGURATION_PATH = 'system/full_page_cache/varnish5/path';
 
     /**
      * @deprecated Varnish 4 is EOL
+     * @see VARNISH_6_CONFIGURATION_PATH
      * XML path to Varnish 4 config template path
      */
     const VARNISH_4_CONFIGURATION_PATH = 'system/full_page_cache/varnish4/path';
 
     /**
      * @deprecated Varnish 4 is EOL
+     * @see VARNISH_SUPPORTED_VERSION_6
      */
     const VARNISH_SUPPORTED_VERSION_4 = '4';
 
     /**
      * @deprecated Varnish 5 is EOL
+     * @see VARNISH_SUPPORTED_VERSION_6
      */
     const VARNISH_SUPPORTED_VERSION_5 = '5';
 
     /**
      * Varnish 6 supported version
+     * @see VARNISH_SUPPORTED_VERSION_6
      */
     const VARNISH_SUPPORTED_VERSION_6 = '6';