PCI/AER: Update aer-inject tool source URL

The aer-inject tool is no longer maintained in the original repository
and is missing a fix related to the musl library. So, with the author's
(Huang Ying) consent, it has been moved to a new repository [1].

Update all references to the repository link.

Link: https://github.com/intel/aer-inject.git [1]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kuppuswamy Sathyanarayanan <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Cc: Huang Ying <[e-mail]>

Documentation/PCI/pcieaer-howto.rst

···
 Then, you need a user space tool named aer-inject, which can be gotten
 from:
 
-    https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/
+    https://github.com/intel/aer-inject.git
 
 More information about aer-inject can be found in the document in
 its source code.

drivers/pci/pcie/Kconfig

···
 	  error injection can fake almost all kinds of errors with the
 	  help of a user space helper tool aer-inject, which can be
 	  gotten from:
-	     https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/
+	     https://github.com/intel/aer-inject.git
 
 config PCIEAER_CXL
 	bool "PCI Express CXL RAS support"

drivers/pci/pcie/aer_inject.c

···
  * trigger various real hardware errors. Software based error
  * injection can fake almost all kinds of errors with the help of a
  * user space helper tool aer-inject, which can be gotten from:
- *   https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/
+ *   https://github.com/intel/aer-inject.git
  *
  * Copyright 2009 Intel Corporation.
  *     Huang Ying <[e-mail]>