target: semihosting: refresh URI to semihosting documentation

Some link if not anymore accessible.
Replace them with current one and add a backup in case one gets
not accessible anymore.

Change-Id: Iffca714555e94e5322a5daac1ea756e36bbd3a8f
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/9188
Tested-by: jenkins

src/target/semihosting_common.c

@@ -24,8 +24,10 @@
  * instruction trapped by the debugger.
  *
  * Details can be found in
- * "Semihosting for AArch32 and AArch64, Release 2.0"
- * https://static.docs.arm.com/100863/0200/semihosting.pdf
+ * "Semihosting for AArch32 and AArch64, 2025Q1"
+ * https://github.com/ARM-software/abi-aa/releases/download/2025Q1/semihosting.pdf
+ * and in
+ * https://developer.arm.com/documentation/dui0203/latest/semihosting
  * from ARM Ltd.
  */