doc: n-api environment life cycle APIs are stable

PR-URL: #34641
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Author: jschlight

doc/api/n-api.md

@@ -348,8 +348,6 @@ NAPI_MODULE_INIT() {
 
 ## Environment life cycle APIs
 
-> Stability: 1 - Experimental
-
 [Section 8.7][] of the [ECMAScript Language Specification][] defines the concept
 of an "Agent" as a self-contained environment in which JavaScript code runs.
 Multiple such Agents may be started and terminated either concurrently or in