Fix a typo: The -> This

Author: ivuk

website/source/docs/commands/refresh.html.markdown

@@ -8,7 +8,7 @@ sidebar_current: "docs-commands-refresh"
 
 The `terraform refresh` command is used to reconcile the state Terraform
 knows about (via its state file) with the real-world infrastructure.
-The can be used to detect any drift from the last-known state, and to
+This can be used to detect any drift from the last-known state, and to
 update the state file.
 
 This does not modify infrastructure, but does modify the state file.