Merge pull request #1788 from malclocke/patch-1

Fix link to shell provisioner [skip ci]

website/source/docs/provisioners/puppet-masterless.html.markdown

@@ -19,7 +19,7 @@ master.
 -> **Note:** Puppet will _not_ be installed automatically
 by this provisioner. This provisioner expects that Puppet is already
 installed on the machine. It is common practice to use the
-[shell provisioner[(/docs/provisioners/shell.html) before the
+[shell provisioner](/docs/provisioners/shell.html) before the
 Puppet provisioner to do this.
 
 ## Basic Example