docs: remove redundant "better" in --fail help

Closes #6385

docs/cmdline-opts/fail.d

@@ -5,7 +5,7 @@ Help: Fail silently (no output at all) on HTTP errors
 Category: important http
 ---
 Fail silently (no output at all) on server errors. This is mostly done to
-better enable scripts etc to better deal with failed attempts. In normal cases
+enable scripts etc to better deal with failed attempts. In normal cases
 when an HTTP server fails to deliver a document, it returns an HTML document
 stating so (which often also describes why and more). This flag will prevent
 curl from outputting that and return error 22.