doc: replace unneeded snake cases

PR-URL: #19951
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

doc/api/process.md

@@ -1181,13 +1181,13 @@ setTimeout(() => {
 ```
 
 
-## process.initgroups(user, extra_group)
+## process.initgroups(user, extraGroup)
 <!-- YAML
 added: v0.9.4
 -->
 
 * `user` {string|number} The user name or numeric identifier.
-* `extra_group` {string|number} A group name or numeric identifier.
+* `extraGroup` {string|number} A group name or numeric identifier.
 
 The `process.initgroups()` method reads the `/etc/group` file and initializes
 the group access list, using all groups of which the user is a member. This is

doc/api/tls.md

@@ -1338,10 +1338,10 @@ socket.pipe(pair.encrypted);
 can be replaced by:
 
 ```js
-secure_socket = tls.TLSSocket(socket, options);
+secureSocket = tls.TLSSocket(socket, options);
 ```
 
-where `secure_socket` has the same API as `pair.cleartext`.
+where `secureSocket` has the same API as `pair.cleartext`.
 
 [`'secureConnect'`]: #tls_event_secureconnect
 [`'secureConnection'`]: #tls_event_secureconnection