clarify shell-local location

website/source/docs/provisioners/shell-local.html.md

@@ -1,8 +1,9 @@
 ---
 description: |
-    The shell Packer provisioner provisions machines built by Packer using shell
-    scripts. Shell provisioning is the easiest way to get software installed and
-    configured on a machine.
+    shell-local will run a shell script of your choosing on the machine where Packer 
+    is being run - in other words, it shell-local will run the shell script on your 
+    build server, or your desktop, etc., rather than the remote/guest machine being 
+    provisioned by Packer.
 layout: docs
 page_title: 'Shell (Local) - Provisioners'
 sidebar_current: 'docs-provisioners-shell-local'
@@ -12,8 +13,12 @@ sidebar_current: 'docs-provisioners-shell-local'
 
 Type: `shell-local`
 
-The local shell provisioner executes a local shell script on the machine running
-Packer. The [remote shell](/docs/provisioners/shell.html) provisioner executes
+shell-local will run a shell script of your choosing on the machine where Packer 
+is being run - in other words, it shell-local will run the shell script on your 
+build server, or your desktop, etc., rather than the remote/guest machine being 
+provisioned by Packer.
+
+The [remote shell](/docs/provisioners/shell.html) provisioner executes
 shell scripts on a remote machine.
 
 ## Basic Example