docs(FluentdConfig): instructions for installing without helm produce decoding error

Describe the bug

Currently it is impossible to follow the instructions for installing without Helm due to an extra tab on .spec in crd.yaml

Reproduction steps

Following the instructions linked above on any Kubernetes cluster should produce the following behavior when executing kubectl apply -f ./crd.yaml:

strict decoding error: unknown field "metadata.spec" for

{
  "apiVersion": "apiextensions.k8s.io/v1",
  "kind": "CustomResourceDefinition",
  "metadata": {
    "annotations": {
      "kubectl.kubernetes.io/last-applied-configuration": "{\"apiVersion\":\"apiextensions.k8s.io/v1\",\"kind\":\"CustomResourceDefinition\",\"metadata\":{\"annotations\":{},\"name\":\"fluentdconfigs.logs.vdp.vmware.com\",\"spec\":{\"conversion\":{\"strategy\":\"None\"},\"group\":\"logs.vdp.vmware.com\",\"names\":{\"kind\":\"FluentdConfig\",\"listKind\":\"FluentdConfigList\",\"plural\":\"fluentdconfigs\",\"singular\":\"fluentdconfig\"},\"scope\":\"Namespaced\",\"versions\":[{\"name\":\"v1beta1\",\"schema\":{\"openAPIV3Schema\":{\"properties\":{\"spec\":{\"properties\":{\"fluentconf\":{\"type\":\"string\"}},\"type\":\"object\"}},\"type\":\"object\"}},\"served\":true,\"storage\":true}]}}}\n"
    },
    "creationTimestamp": "2023-01-06T20:59:39Z",
    "generation": 1,
    "managedFields": [
      {
        "manager": "config-reloader",
        "operation": "Update",
        "apiVersion": "apiextensions.k8s.io/v1",
        "time": "2023-01-06T20:59:39Z",
        "fieldsType": "FieldsV1",
        "fieldsV1": {
          "f:spec": {
            "f:conversion": {
              ".": {},
              "f:strategy": {}
            },
            "f:group": {},
            "f:names": {
              "f:kind": {},
              "f:listKind": {},
              "f:plural": {},
              "f:singular": {}
            },
            "f:scope": {},
            "f:versions": {}
          }
        }
      },
      {
        "manager": "kube-apiserver",
        "operation": "Update",
        "apiVersion": "apiextensions.k8s.io/v1",
        "time": "2023-01-06T20:59:39Z",
        "fieldsType": "FieldsV1",
        "fieldsV1": {
          "f:status": {
            "f:acceptedNames": {
              "f:kind": {},
              "f:listKind": {},
              "f:plural": {},
              "f:singular": {}
            },
            "f:conditions": {
              "k:{\"type\":\"Established\"}": {
                ".": {},
                "f:lastTransitionTime": {},
                "f:message": {},
                "f:reason": {},
                "f:status": {},
                "f:type": {}
              },
              "k:{\"type\":\"NamesAccepted\"}": {
                ".": {},
                "f:lastTransitionTime": {},
                "f:message": {},
                "f:reason": {},
                "f:status": {},
                "f:type": {}
              }
            }
          }
        },
        "subresource": "status"
      },
      {
        "manager": "kubectl-client-side-apply",
        "operation": "Update",
        "apiVersion": "apiextensions.k8s.io/v1",
        "time": "2023-01-06T21:08:16Z",
        "fieldsType": "FieldsV1",
        "fieldsV1": {
          "f:metadata": {
            "f:annotations": {
              ".": {},
              "f:kubectl.kubernetes.io/last-applied-configuration": {}
            }
          }
        }
      }
    ],
    "name": "fluentdconfigs.logs.vdp.vmware.com",
    "resourceVersion": "65538",
    "spec": {
      "conversion": {
        "strategy": "None"
      },
      "group": "logs.vdp.vmware.com",
      "names": {
        "kind": "FluentdConfig",
        "listKind": "FluentdConfigList",
        "plural": "fluentdconfigs",
        "singular": "fluentdconfig"
      },
      "scope": "Namespaced",
      "versions": [
        {
          "name": "v1beta1",
          "schema": {
            "openAPIV3Schema": {
              "properties": {
                "spec": {
                  "properties": {
                    "fluentconf": {
                      "type": "string"
                    }
                  },
                  "type": "object"
                }
              },
              "type": "object"
            }
          },
          "served": true,
          "storage": true
        }
      ]
    },
    "uid": "ba4a9367-f694-43ec-a512-0e37cf7ac96b"
  },
  "status": {
    "conditions": [
      {
        "type": "NamesAccepted",
        "status": "True",
        "lastTransitionTime": "2023-01-06T20:59:39Z",
        "reason": "NoConflicts",
        "message": "no conflicts found"
      },
      {
        "type": "Established",
        "status": "True",
        "lastTransitionTime": "2023-01-06T20:59:39Z",
        "reason": "InitialNamesAccepted",
        "message": "the initial names have been accepted"
      }
    ],
    "acceptedNames": {
      "plural": "fluentdconfigs",
      "singular": "fluentdconfig",
      "kind": "FluentdConfig",
      "listKind": "FluentdConfigList"
    },
    "storedVersions": [
      "v1beta1"
    ]
  }
}

Expected behavior

$ kubectl apply -f ./crd.yaml 

Warning: resource customresourcedefinitions/fluentdconfigs.logs.vdp.vmware.com is missing the kubectl.kubernetes.io/last-applied-configuration annotation which is required by kubectl apply. kubectl apply should only be used on resources created declaratively by either kubectl create --save-config or kubectl apply. The missing annotation will be patched automatically.
customresourcedefinition.apiextensions.k8s.io/fluentdconfigs.logs.vdp.vmware.com configured

Additional context

Root Cause:
https://github.com/vmware/kube-fluentd-operator/blob/281290e24df05081a113728ea5d3d7a8ff4f5ce7/kubectl/crd.yaml#L6

Related PR:
#188