doc: add missing comma in net documentation

PR-URL: #24074
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>

Author: Trott

doc/api/net.md

@@ -167,7 +167,7 @@ The number of concurrent connections on the server.
 
 This becomes `null` when sending a socket to a child with
 [`child_process.fork()`][]. To poll forks and get current number of active
-connections use asynchronous [`server.getConnections()`][] instead.
+connections, use asynchronous [`server.getConnections()`][] instead.
 
 ### server.getConnections(callback)
 <!-- YAML