Fix CRD yaml file for right explan information

[s1061123]

With patch:

[centos@kube-master1 ~]$ kubectl explain net-attach-def
KIND:     NetworkAttachmentDefinition
VERSION:  k8s.cni.cncf.io/v1

DESCRIPTION:
     NetworkAttachmentDefinition is a CRD schema specified by the Network
     Plumbing Working Group to express the intent for attaching pods to one or
     more logical or physical networks. More information available at:
     https://github.com/k8snetworkplumbingwg/multi-net-spec

FIELDS:
   apiVersion	<string>
     APIVersion defines the versioned schema of this representation of an
     object. Servers should convert recognized schemas to the latest internal
     value, and may reject unrecognized values. More info:
     https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources

   kind	<string>
     Kind is a string value representing the REST resource this object
     represents. Servers may infer this from the endpoint the client submits
     requests to. Cannot be updated. In CamelCase. More info:
     https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds

   metadata	<Object>
     Standard object's metadata. More info:
     https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata

   spec	<Object>
     NetworkAttachmentDefinition spec defines the desired state of a network
     attachment

[coveralls]

Pull Request Test Coverage Report for Build 185128251

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 70.997%

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Totals
Change from base Build 177788642:	0.0%
Covered Lines:	1082
Relevant Lines:	1524

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💛 - Coveralls

[dougbtv]

LGTM!