MC-14863 Update Varnish version number

guides/v2.2/config-guide/varnish/config-varnish-install.md

@@ -11,26 +11,30 @@ functional_areas:
 
 Installing the Varnish software is beyond the scope of this guide. For more information about installing Varnish, see:
 
-*	[installation wiki](http://wiki.mikejung.biz/Varnish)
-*	[Varnish installation guides](https://www.varnish-cache.org/docs)
-*	[How to install Varnish (Tecmint)](http://www.tecmint.com/install-varnish-cache-web-accelerator)
+* [installation wiki](http://wiki.mikejung.biz/Varnish)
+* [Varnish installation guides](https://www.varnish-cache.org/docs)
+* [How to install Varnish (Tecmint)](http://www.tecmint.com/install-varnish-cache-web-accelerator)
 
 {:.bs-callout .bs-callout-info}
-This topic is written for Varnish on CentOS and Apache 2.2. If you're setting up Varnish in a different environment, some commands are likely different. Consult the preceding documentation for more information.<br><br>If you intend to install Varnish modules (vmods), such as saint mode, you should install Varnish by compiling the code, rather than installing from a package. See [Saint mode]({{ page.baseurl }}/config-guide/varnish/config-varnish-advanced.html#saint) for more details.
+This topic is written for Varnish on CentOS and Apache 2.2. If you are setting up Varnish in a different environment, some commands are likely different. Consult the preceding documentation for more information.<br><br>If you intend to install Varnish modules (vmods), such as saint mode, you should install Varnish by compiling the code, rather than installing from a package. See [Saint mode]({{ page.baseurl }}/config-guide/varnish/config-varnish-advanced.html#saint) for more details.
 
 ## Confirm your Varnish version {#config-varnish-version}
 
-Enter the following command to display the version of Varnish you're running:
+Enter the following command to display the version of Varnish you are running:
 
-	varnishd -V
+```bash
+varnishd -V
+```
 
 A sample follows:
 
-	varnishd (varnish-4.0.3 revision b8c4a34)
-	Copyright (c) 2006 Verdens Gang AS
-	Copyright (c) 2006-2014 Varnish Software AS
+```terminal
+varnishd (varnish-4.0.3 revision b8c4a34)
+Copyright (c) 2006 Verdens Gang AS
+Copyright (c) 2006-2014 Varnish Software AS
+```
 
-Make sure the version is 4.x or 5.x before continuing. If you are running version 3.x, you must upgrade to a supported version. Consult the Varnish installation documentation for more information.
+Make sure the version is 4.x, 5.2 or 6.x before continuing. If you are running version 3.x, you must upgrade to a supported version. Consult the Varnish installation documentation for more information.
 
 ### Next step
 

guides/v2.3/graphql/caching.md

@@ -37,7 +37,7 @@ Magento explicitly disallows caching the following queries.
 
 We recommend setting up Varnish as a reverse proxy to serve the full page cache in a production environment. See [Configure and use Varnish]({{page.baseurl}}/config-guide/varnish/config-varnish.html) for more information.
 
-Magento 2.3.2 updates the `vcl_hash` subroutine in the template `varnish.vcl` file and creates the `process_graphql_headers` subroutine for both Varnish 4.x and 5.x. To enable GraphQL caching, either generate a new template file, or edit the `default.vcl` file on your system to match the current default template.
+As of Magento 2.3.2, Magento supports GraphQL caching with Varnish. If you have upgraded from a previous version, you can enable GraphQL caching by generating a new template file, or by editing the `default.vcl` file on your system to match the current default template for your version of Varnish.
 
 If you choose to edit an existing `default.vcl` file, update the `vcl_hash` subroutine to check whether the request URL contains `graphql`, as follows:
 

guides/v2.3/install-gde/system-requirements-tech.md

@@ -103,7 +103,7 @@ Mail Transfer Agent (MTA) or an SMTP server
 
 * [Redis]({{page.baseurl}}/config-guide/redis/config-redis.html) versions 3.2, 4.0, 5.0 (compatible with 2.4+) for page caching and session storage.
   Version 5.0 is highly recommended.
-* [Varnish]({{page.baseurl}}/config-guide/varnish/config-varnish.html) version 4.x or 5.2
+* [Varnish]({{page.baseurl}}/config-guide/varnish/config-varnish.html) version 4.x, 5.2 or 6.2
 * [Elasticsearch]({{page.baseurl}}/config-guide/elasticsearch/es-overview.html)
 
   {{site.data.var.ee}} version 2.3.x supports the following Elasticsearch versions: