doc: fix small typo in process.md

PR-URL: #57333
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Moshe Atlow <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Felix Rieseberg

doc/api/process.md

@@ -4231,7 +4231,7 @@ added: v23.9.0
 -->
 
 * `previousValue` {Object} A previous return value from calling
-  `process.cpuUsage()`
+  `process.threadCpuUsage()`
 * Returns: {Object}
   * `user` {integer}
   * `system` {integer}