perf_hooks: move perf_hooks out of experimental

PR-URL: nodejs#31101
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Stephen Belanger <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Jiawen Geng <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

doc/api/perf_hooks.md

@@ -2,7 +2,7 @@
 
 <!--introduced_in=v8.5.0-->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 The Performance Timing API provides an implementation of the
 [W3C Performance Timeline][] specification. The purpose of the API