doc: mark --cpu-prof and related flags stable

doc/api/cli.md

@@ -494,9 +494,14 @@ node -C development app.js
 
 <!-- YAML
 added: v12.0.0
+changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/53343
+    description: The `--cpu-prof` flags are now stable.
 -->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 Starts the V8 CPU profiler on start up, and writes the CPU profile to disk
 before exit.
@@ -517,9 +522,14 @@ CPU.20190409.202950.15293.0.0.cpuprofile
 
 <!-- YAML
 added: v12.0.0
+changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/53343
+    description: The `--cpu-prof` flags are now stable.
 -->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 Specify the directory where the CPU profiles generated by `--cpu-prof` will
 be placed.
@@ -531,9 +541,14 @@ The default value is controlled by the
 
 <!-- YAML
 added: v12.2.0
+changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/53343
+    description: The `--cpu-prof` flags are now stable.
 -->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 Specify the sampling interval in microseconds for the CPU profiles generated
 by `--cpu-prof`. The default is 1000 microseconds.
@@ -542,9 +557,14 @@ by `--cpu-prof`. The default is 1000 microseconds.
 
 <!-- YAML
 added: v12.0.0
+changes:
+  - version:
+    - REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/53343
+    description: The `--cpu-prof` flags are now stable.
 -->
 
-> Stability: 1 - Experimental
+> Stability: 2 - Stable
 
 Specify the file name of the CPU profile generated by `--cpu-prof`.