docs: pci: fix broken links due to conversion from pci.txt to pci.rst

Some documentation files were still pointing to the old place.

Fixes: 229b4e07 ("Documentation: PCI: convert pci.txt to reST")
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/memory-barriers.txt

@@ -548,7 +548,7 @@ There are certain things that the Linux kernel memory barriers do not guarantee:
 
 	[*] For information on bus mastering DMA and coherency please read:
 
-	    Documentation/PCI/pci.txt
+	    Documentation/PCI/pci.rst
 	    Documentation/DMA-API-HOWTO.txt
 	    Documentation/DMA-API.txt
 

Documentation/translations/ko_KR/memory-barriers.txt

@@ -569,7 +569,7 @@ ACQUIRE 는 해당 오퍼레이션의 로드 부분에만 적용되고 RELEASE
 
 	[*] 버스 마스터링 DMA 와 일관성에 대해서는 다음을 참고하시기 바랍니다:
 
-	    Documentation/PCI/pci.txt
+	    Documentation/PCI/pci.rst
 	    Documentation/DMA-API-HOWTO.txt
 	    Documentation/DMA-API.txt
 

drivers/scsi/hpsa.c

@@ -7760,7 +7760,7 @@ static void hpsa_free_pci_init(struct ctlr_info *h)
 	hpsa_disable_interrupt_mode(h);		/* pci_init 2 */
 	/*
 	 * call pci_disable_device before pci_release_regions per
-	 * Documentation/PCI/pci.txt
+	 * Documentation/PCI/pci.rst
 	 */
 	pci_disable_device(h->pdev);		/* pci_init 1 */
 	pci_release_regions(h->pdev);		/* pci_init 2 */
@@ -7843,7 +7843,7 @@ static int hpsa_pci_init(struct ctlr_info *h)
 clean1:
 	/*
 	 * call pci_disable_device before pci_release_regions per
-	 * Documentation/PCI/pci.txt
+	 * Documentation/PCI/pci.rst
 	 */
 	pci_disable_device(h->pdev);
 	pci_release_regions(h->pdev);