dt-bindings: PCI: Remove obsolete .txt docs

JIRA: https://issues.redhat.com/browse/RHEL-107597
Upstream Status: d63dbfc

commit d63dbfc
Author: Rob Herring (Arm) <robh@kernel.org>
Date:   Fri Apr 4 17:15:57 2025 -0500

    dt-bindings: PCI: Remove obsolete .txt docs

    The content in these files has been moved to the schemas in dtschema.
    pci.txt is covered by pci-bus-common.yaml and pci-host-bridge.yaml.
    pci-iommu.txt is covered by pci-iommu.yaml. pci-msi.txt is covered in
    msi-map property in pci-host-bridge.yaml.

    Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
    Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    Reviewed-by: Frank Li <Frank.Li@nxp.com>
    Cc: Frank Li <Frank.li@nxp.com>
    Link: https://patch.msgid.link/20250404221559.552201-1-robh@kernel.org

Signed-off-by: Myron Stowe <mstowe@redhat.com>

Author: Myron Stowe

Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml

@@ -74,7 +74,7 @@ properties:
 
   reset-gpios:
     description: Must contain a phandle to a GPIO controller followed by GPIO
-      that is being used as PERST input signal. Please refer to pci.txt.
+      that is being used as PERST input signal.
 
   phys:
     minItems: 1