libcurl: Restrict redirect schemes (follow-up)

- Allow FTPS on redirect.

- Update default allowed redirect protocols in documentation.

Follow-up to 6080ea0.

Ref: https://github.com/curl/curl/pull/4094

Closes https://github.com/curl/curl/pull/4115

lib/setopt.c

@@ -2374,8 +2374,7 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
   case CURLOPT_REDIR_PROTOCOLS:
     /* set the bitmask for the protocols that libcurl is allowed to follow to,
        as a subset of the CURLOPT_PROTOCOLS ones. That means the protocol needs
-       to be set in both bitmasks to be allowed to get redirected to. Defaults
-       to all protocols except FILE and SCP. */
+       to be set in both bitmasks to be allowed to get redirected to. */
     data->set.redir_protocols = va_arg(param, long);
     break;