pop3-multi.c: Corrected copy/paste typo

docs/examples/pop3-multi.c

@@ -23,7 +23,7 @@
 #include <curl/curl.h>
 
 /* This is a simple example showing how to retrieve mail using libcurl's POP3
- * capabilities. It builds on the smtp-mail.c example to demonstrate how to use
+ * capabilities. It builds on the pop3-retr.c example to demonstrate how to use
  * libcurl's multi interface.
  *
  * Note that this example requires libcurl 7.20.0 or above.