Update X-Forwarded-Proto doc to say "https / http"

Closes gh-34959

Signed-off-by: Dhruv <dhruv2015@hotmail.co.uk>

framework-docs/modules/ROOT/partials/web/forwarded-headers.adoc

@@ -38,7 +38,7 @@ to inform the server that the original port was `443`.
 ==== X-Forwarded-Proto
 
 While not standard, https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto[`X-Forwarded-Proto: (https|http)`]
-is a de-facto standard header that is used to communicate the original protocol (for example, https / https)
+is a de-facto standard header that is used to communicate the original protocol (for example, https / http)
 to a downstream server. For example, if a request of `https://example.com/resource` is sent to
 a proxy which forwards the request to `http://localhost:8080/resource`, then a header of
 `X-Forwarded-Proto: https` can be sent to inform the server that the original protocol was `https`.
@@ -119,4 +119,4 @@ https://example.com/api/app1/{path} -> http://localhost:8080/app1/{path}
 
 In this case, the proxy has a prefix of `/api/app1` and the server has a prefix of
 `/app1`. The proxy can send `X-Forwarded-Prefix: /api/app1` to have the original prefix
-`/api/app1` override the server prefix `/app1`.
+`/api/app1` override the server prefix `/app1`.