Replace broken URLs in library metadata

The `url` property in the library metadata is used to direct the user to resources related to the library. The URL
defined by this property is used as the target for the "More info" link in Arduino Cloud Editor's Library Manager.

Previously, some of the platform bundled libraries had an incorrect `url` property value that only led to a 404 page.

Author: per1234

libraries/SDU/library.properties

@@ -5,5 +5,5 @@ maintainer=Arduino <info@arduino.cc>
 sentence=Update the sketch on your board from an SD card
 paragraph=Requires an SD card
 category=Other
-url=http://www.arduino.cc/en/Reference/SDU
+url=https://github.com/arduino/ArduinoCore-renesas/tree/main/libraries/SDU
 architectures=renesas,renesas_uno

libraries/SFU/library.properties

@@ -5,5 +5,5 @@ maintainer=Arduino <info@arduino.cc>
 sentence=Second stage bootloader for Portenta C33
 paragraph=
 category=Other
-url=https://www.arduino.cc/en/Reference/SFU
+url=https://github.com/arduino/ArduinoCore-renesas/tree/main/libraries/SFU
 architectures=renesas_portenta,renesas

libraries/WiFiS3/library.properties

@@ -5,6 +5,6 @@ maintainer=Arduino <info@arduino.cc>
 sentence=Enables network connection (local and Internet) with the Arduino Leven.
 paragraph=With this library you can instantiate Servers, Clients and send/receive UDP packets through WiFi. The board can connect either to open or encrypted networks (WEP, WPA). The IP address can be assigned statically or through a DHCP. The library can also manage DNS.
 category=Communication
-url=http://www.arduino.cc/en/Reference/WiFiS3
+url=https://docs.arduino.cc/tutorials/uno-r4-wifi/wifi-examples/
 architectures=renesas,renesas_uno
 includes=WiFiS3.h

libraries/lwIpWrapper/library.properties

@@ -5,7 +5,7 @@ maintainer=Arduino <info@arduino.cc>
 sentence=Interface network interfaces with lwIP 
 paragraph=This library is the basic layer to interface network interfaces (Ethernet, WiFi) with lwIP library
 category=Communication
-url=https://github.com/arduino/ArduinoCore-renesas/tree/master/libraries/LwIpWrapper
+url=https://github.com/arduino/ArduinoCore-renesas/tree/main/libraries/lwIpWrapper
 architectures=renesas,renesas_portenta
 precompiled=true
 ldflags=-llwIP