Add info on where to get more details.

jbranchaud · jbranchaud · commit b12141953a7d · 2015-12-20T17:26:20.000-06:00
diff --git a/unix/copying-file-contents-to-system-paste-buffer.md b/unix/copying-file-contents-to-system-paste-buffer.md
@@ -8,3 +8,5 @@ paste buffer.
 ```
 $ cat some-file.txt | pbcopy
 ```
+
+See `man pbcopy` for more details.
