Documentation: PCI: convert pci-error-recovery.txt to reST

Convert plain text documentation to reStructuredText format and add it to
Sphinx TOC tree.  No essential content change.
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/PCI/index.rst

@@ -13,3 +13,4 @@ Linux PCI Bus Subsystem
    pci-iov-howto
    msi-howto
    acpi-info
+   pci-error-recovery

MAINTAINERS

@@ -12143,7 +12143,7 @@ M:	Sam Bobroff <sbobroff@linux.ibm.com>
 M:	Oliver O'Halloran <oohall@gmail.com>
 L:	linuxppc-dev@lists.ozlabs.org
 S:	Supported
-F:	Documentation/PCI/pci-error-recovery.txt
+F:	Documentation/PCI/pci-error-recovery.rst
 F:	drivers/pci/pcie/aer.c
 F:	drivers/pci/pcie/dpc.c
 F:	drivers/pci/pcie/err.c
@@ -12156,7 +12156,7 @@ PCI ERROR RECOVERY
 M:	Linas Vepstas <linasvepstas@gmail.com>
 L:	linux-pci@vger.kernel.org
 S:	Supported
-F:	Documentation/PCI/pci-error-recovery.txt
+F:	Documentation/PCI/pci-error-recovery.rst
 
 PCI MSI DRIVER FOR ALTERA MSI IP
 M:	Ley Foon Tan <lftan@altera.com>