doc: mark assert.CallTracker experimental

BridgeAR · addaleax · commit 4277d952c035 · 2020-09-23T22:03:25.000+02:00
Some details might still change and it would be good to get feedback from users before we mark this as stable. Signed-off-by: Ruben Bridgewater <ruben@bridgewater.de> PR-URL: #33124 Reviewed-By: Zeyu Yang <himself65@outlook.com> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Michaël Zasso <targos@protonmail.com>
diff --git a/doc/api/assert.md b/doc/api/assert.md
@@ -150,6 +150,13 @@ try {
 ```
 
 ## Class: `assert.CallTracker`
+<!-- YAML
+added: REPLACEME
+-->
+
+> Stability: 1 - Experimental
+
+This feature is currently experimental and behavior might still change.
 
 ###&nbsp;`new assert.CallTracker()`
 <!-- YAML
