pcieaer doc: update the link

The original link is empty, replace it.

Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/PCI/pcieaer-howto.txt b/Documentation/PCI/pcieaer-howto.txt
index ea8cafb..acd0ddd 100644
--- a/Documentation/PCI/pcieaer-howto.txt
+++ b/Documentation/PCI/pcieaer-howto.txt
@@ -256,7 +256,7 @@
 
 Then, you need a user space tool named aer-inject, which can be gotten
 from:
-    http://www.kernel.org/pub/linux/utils/pci/aer-inject/
+    https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/
 
 More information about aer-inject can be found in the document comes
 with its source code.