isdn/capi: Replace HTTP links with HTTPS ones

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.
Signed-off-by: NAlexander A. Klimov <grandmaster@al2klimov.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/isdn/capi/Kconfig

@@ -5,7 +5,7 @@ config ISDN_CAPI
 	  This provides CAPI (the Common ISDN Application Programming
 	  Interface) Version 2.0, a standard making it easy for programs to
 	  access ISDN hardware in a device independent way. (For details see
-	  <http://www.capi.org/>.)  CAPI supports making and accepting voice
+	  <https://www.capi.org/>.)  CAPI supports making and accepting voice
 	  and data connections, controlling call options and protocols,
 	  as well as ISDN supplementary services like call forwarding or
 	  three-party conferences (if supported by the specific hardware