DOC-178 add links to upgrade doc

Author: markzegarelli

src/connections/sources/catalog/libraries/website/javascript/ajs-classic.md

@@ -10,7 +10,7 @@ strat: ajs
 Analytics.js, Segment's Javascript source, makes it simple to send your data to any tool without having to learn, test or implement a new API every time.
 
 > info "Analytics.js 2.0"
-> A new version of Analytics.js is available for use in Beta. Click [here](/docs/connections/sources/catalog/libraries/website/javascript/) for more information.
+> A new version of Analytics.js is available for use in Beta. Click [here](/docs/connections/sources/catalog/libraries/website/javascript/) for more information. For information about upgrading to Analytics.js 2.0, see [Upgrade to Analytics.js 2.0](/docs/connections/sources/catalog/libraries/website/javascript/upgrade-to-ajs2).
 
 ## Getting Started
 

src/connections/sources/catalog/libraries/website/javascript/index.md

@@ -36,6 +36,8 @@ Analytics.js 2.0 introduces new ways for developers to augment events throughout
 
 Read through the [Analytics.js QuickStart Guide](/docs/connections/sources/catalog/libraries/website/javascript/quickstart/) which explains how to add Analytics.js to your site in just a few minutes. Once you've installed the library, read on for the detailed API reference!
 
+For information about upgrading to Analytics.js 2.0, see [Upgrade to Analytics.js 2.0](/docs/connections/sources/catalog/libraries/website/javascript/upgrade-to-ajs2).
+
 ### Upgrade your existing Javascript sources
 
 For information about upgrading your existing javascript sources, see [Upgrade to A.js 2.0](/docs/connections/sources/catalog/libraries/website/javascript/upgrade-to-ajs2).