doc: revise description of process.ppid

PR-URL: nodejs#35589
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: PoojaDurgad

doc/api/process.md

@@ -1739,7 +1739,8 @@ added:
 
 * {integer}
 
-The `process.ppid` property returns the PID of the current parent process.
+The `process.ppid` property returns the PID of the parent of the
+current process.
 
 ```js
 console.log(`The parent process is pid ${process.ppid}`);