website: Activate HCL syntax highlighting for Vault provider docs

website/source/docs/providers/vault/d/generic_secret.html.md

@@ -25,7 +25,7 @@ for more details.
 
 ## Example Usage
 
-```
+```hcl
 data "vault_generic_secret" "rundeck_auth" {
   path = "secret/rundeck_auth"
 }

website/source/docs/providers/vault/index.html.markdown

@@ -126,7 +126,7 @@ The `client_auth` configuration block accepts the following arguments:
 
 ## Example Usage
 
-```
+```hcl
 provider "vault" {
   # It is strongly recommended to configure this provider through the
   # environment variables described above, so that each user can have

website/source/docs/providers/vault/r/generic_secret.html.md

@@ -25,7 +25,7 @@ for more details.
 
 ## Example Usage
 
-```
+```hcl
 resource "vault_generic_secret" "example" {
   path = "secret/foo"
 

website/source/docs/providers/vault/r/policy.md

@@ -11,7 +11,7 @@ description: |-
 
 ## Example Usage
 
-```
+```hcl
 resource "vault_policy" "example" {
   name = "dev-team"