website: page titles on provisioner docs

website/source/docs/provisioners/chef-solo.html.markdown

 ---
 layout: "docs"
+page_title: "Chef-Solo Provisioner"
 ---
 
 # Chef Solo Provisioner

website/source/docs/provisioners/custom.html.markdown

 ---
 layout: "docs"
+page_title: "Custom Provisioner"
 ---
 
 # Custom Provisioner

website/source/docs/provisioners/file.html.markdown

 ---
 layout: "docs"
+page_title: "File Provisioner"
 ---
 
 # File Provisioner

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

 ---
 layout: "docs"
+page_title: "Salt (Masterless) Provisioner"
 ---
 
 # Salt Masterless Provisioner

website/source/docs/provisioners/shell.html.markdown

 ---
 layout: "docs"
+page_title: "Shell Provisioner"
 ---
 
 # Shell Provisioner