Improve documentation on why we use os.userInfo()

(use correct syscall name)

paths.js

@@ -2,8 +2,9 @@ const os = require('os');
 const core = require('@actions/core');
 
 const defaults = (process.env['OS'] != 'Windows_NT') ? {
-    // Use getent() system call, since this is what ssh does; makes a difference in Docker-based
-    // Action runs, where $HOME is different from the pwent
+    // We use os.userInfo() rather than os.homedir(), since it uses the getpwuid() system call to get the user's home directory (see https://nodejs.org/api/os.html#osuserinfooptions).
+    // This mimics the way openssh derives the home directory for locating config files (see https://github.com/openssh/openssh-portable/blob/826483d51a9fee60703298bbf839d9ce37943474/ssh.c#L710);
+    // Makes a difference in Docker-based Action runs, when $HOME is different from what getpwuid() returns (which is based on the entry in /etc/passwd)
     homePath: os.userInfo().homedir,
     sshAgentCmdDefault: 'ssh-agent',
     sshAddCmdDefault: 'ssh-add',