doc: add stability index to crypto.hash()

PR-URL: #51978
Reviewed-By: Filip Skokan <[email protected]>
Reviewed-By: Rafael Gonzaga <[email protected]>
Reviewed-By: Marco Ippolito <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: joyeecheung

doc/api/crypto.md

@@ -3637,6 +3637,8 @@ added:
  - REPLACEME
 -->
 
+> Stability: 1.2 - Release candidate
+
 * `algorithm` {string|undefined}
 * `data` {string|ArrayBuffer|Buffer|TypedArray|DataView} When `data` is a
   string, it will be encoded as UTF-8 before being hashed. If a different