Add a missing word

website/docs/language/resources/provisioners/local-exec.mdx

@@ -57,7 +57,7 @@ The following arguments are supported:
 * `environment` - (Optional) block of key value pairs representing the
   environment of the executed command. inherits the current process environment.
 
-* `when` - (Optional) If provided, specifies Terraform will execute the command.
+* `when` - (Optional) If provided, specifies when Terraform will execute the command.
   For example, `when = destroy` specifies that the provisioner will run when the associated resource
   is destroyed. Refer to [Destroy-Time Provisioners](/language/resources/provisioners/syntax#destroy-time-provisioners)
   for details.