plugin.xml changes for release 2023.10

[alisevych]

Description

plugin.xml changes:

1. Minor Overview correction
2. New What's New text

How to test

Manual tests

1. Publish IntelliJ plugin
2. Install into IDEA 2023.2
3. Check Overview and What's New tabs in IDEA (Settings->Plugins->Installed)

Self-check list

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.