Remove V3 pre-release note and add tip for insert key

Signed-off-by: adam-wolfe <[email protected]>

packages/zowe-explorer/README.md

@@ -5,8 +5,6 @@
 [![codecov](https://codecov.io/gh/zowe/zowe-explorer-vscode/branch/main/graph/badge.svg)](https://codecov.io/gh/zowe/zowe-explorer-vscode)
 [![slack](https://img.shields.io/badge/chat-on%20Slack-blue)](https://slack.openmainframeproject.org/)
 
-> ## v3 Pre-release is now available in our [Github Releases](https://github.com/zowe/zowe-explorer-vscode/releases) with the removal of v1 profile support. Keep an eye on [changes affecting users and extenders](https://github.com/zowe/zowe-explorer-vscode/wiki/v3-Changes-for-Users-and-Extenders) for the full list of changes
-
 ## Introduction
 
 [Zowe Explorer](https://github.com/zowe/community#zowe-explorer) is a sub-project of Zowe, focusing on modernizing the mainframe experience. [Zowe](https://www.zowe.org/) is a project hosted by the [Open Mainframe Project](https://www.openmainframeproject.org/), a [Linux Foundation](https://www.linuxfoundation.org/) project.
@@ -156,6 +154,8 @@ Your token has been successfully invalidated.
 
 - **Open recent members**: Zowe Explorer lets you open a list of members you worked on earlier. You can access the list by pressing `Ctrl`+`Alt`+`R` (Windows) or `Command`+`Option`+`R` (Mac).
 
+- **Insert/overtype mode**: Visual Studio Code v1.96 introduced the ability to toggle between insert and overtype mode by pressing the `Insert` key. Overtype mode can be helpful when working with data sets and members with fixed record lengths.
+
 For the comprehensive Zowe Explorer documentation that also includes information about USS and Jobs interactions, see [the Zowe Explorer documentation](https://docs.zowe.org/stable/user-guide/ze-install.html) in Zowe Docs.
 
 ## Keyboard Shortcuts