Documentation: fix typos in name of application folder

The name is "application/", not "applications/".

(This commit does not change managing_apps.rst,
 where "applications/" is used intentionally).
diff --git a/user_guide_src/source/libraries/file_uploading.rst b/user_guide_src/source/libraries/file_uploading.rst
index 1698dcb..cceadfc 100644
--- a/user_guide_src/source/libraries/file_uploading.rst
+++ b/user_guide_src/source/libraries/file_uploading.rst
@@ -26,7 +26,7 @@
 ========================
 
 Using a text editor, create a form called upload_form.php. In it, place
-this code and save it to your applications/views/ folder::
+this code and save it to your application/views/ folder::
 
 	<html>
 	<head>
@@ -59,7 +59,7 @@
 ================
 
 Using a text editor, create a form called upload_success.php. In it,
-place this code and save it to your applications/views/ folder::
+place this code and save it to your application/views/ folder::
 
 	<html>
 	<head>
@@ -84,7 +84,7 @@
 ==============
 
 Using a text editor, create a controller called upload.php. In it, place
-this code and save it to your applications/controllers/ folder::
+this code and save it to your application/controllers/ folder::
 
 	<?php