Refactor: improve consistency of the term "directory".

This commit changes the term "folder" to "directory" in every
instance where the first is used in an example description, but the
second is used in the example code, and vice versa.

pages/common/scp.md

@@ -13,7 +13,7 @@
 
 - Recursively copy the contents of a directory from a remote host to a local directory:
 
-`scp -r {{remote_host}}:{{path/to/remote_dir}} {{path/to/local_dir}}`
+`scp -r {{remote_host}}:{{path/to/remote_directory}} {{path/to/local_directory}}`
 
 - Copy a file between two remote hosts transferring through the local host: