Improve setting description for enabling A/B tests (microsoft#17585)

* Issue 7793 solved, rewrite discription for experiment enabling

* added news entry

* Update news/2 Fixes/7793.md

* Update news/2 Fixes/7793.md

* Update news/2 Fixes/7793.md

* moved news entry from 2 Fixes to 1 Enhancement

Author: Thi Le

news/1 Enhancements/7793.md

@@ -0,0 +1 @@
+Improve setting description for enabling A/B tests. (Thanks [Thi Le](https://github.com/thi-lee))

package.json

@@ -605,7 +605,7 @@
                 },
                 "python.experiments.enabled": {
                     "default": true,
-                    "description": "Enables/disables A/B tests.",
+                    "description": "Enables A/B tests experiments in the Python extension. If enabled, you may get included in proposed enhancements and/or features.",
                     "scope": "machine",
                     "type": "boolean"
                 },