Add docs notes for deprecation

website/docs/provisioners/chef.html.markdown

@@ -12,8 +12,9 @@ The `chef` provisioner installs, configures and runs the Chef Client on a remote
 resource. The `chef` provisioner supports both `ssh` and `winrm` type
 [connections](/docs/provisioners/connection.html).
 
--> **Note:** Provisioners should only be used as a last resort. For most
-common situations there are better alternatives. For more information, see
+-> **Note:** This provisioner has been deprecated as of Terraform 0.13.4 and will be
+removed in a future version of Terraform. For most common situations there are better
+alternatives to using provisioners. For more information, see
 [the main Provisioners page](./).
 
 ## Requirements

website/docs/provisioners/habitat.html.markdown

@@ -10,8 +10,9 @@ description: |-
 
 The `habitat` provisioner installs the [Habitat](https://habitat.sh) supervisor and loads configured services. This provisioner only supports Linux targets using the `ssh` connection type at this time.
 
--> **Note:** Provisioners should only be used as a last resort. For most
-common situations there are better alternatives. For more information, see
+-> **Note:** This provisioner has been deprecated as of Terraform 0.13.4 and will be
+removed in a future version of Terraform. For most common situations there are better
+alternatives to using provisioners. For more information, see
 [the main Provisioners page](./).
 
 ## Requirements

website/docs/provisioners/puppet.html.markdown

@@ -12,8 +12,9 @@ The `puppet` provisioner installs, configures and runs the Puppet agent on a
 remote resource. The `puppet` provisioner supports both `ssh` and `winrm` type
 [connections](/docs/provisioners/connection.html).
 
--> **Note:** Provisioners should only be used as a last resort. For most
-common situations there are better alternatives. For more information, see
+-> **Note:** This provisioner has been deprecated as of Terraform 0.13.4 and will be
+removed in a future version of Terraform. For most common situations there are better
+alternatives to using provisioners. For more information, see
 [the main Provisioners page](./).
 
 ## Requirements

website/docs/provisioners/salt-masterless.html.md

@@ -13,8 +13,9 @@ Type: `salt-masterless`
 The `salt-masterless` Terraform provisioner provisions machines built by Terraform
 using [Salt](http://saltstack.com/) states, without connecting to a Salt master. The `salt-masterless` provisioner supports `ssh` [connections](/docs/provisioners/connection.html).
 
--> **Note:** Provisioners should only be used as a last resort. For most
-common situations there are better alternatives. For more information, see
+-> **Note:** This provisioner has been deprecated as of Terraform 0.13.4 and will be
+removed in a future version of Terraform. For most common situations there are better
+alternatives to using provisioners. For more information, see
 [the main Provisioners page](./).
 
 ## Requirements