Add namespace to API docs examples

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

Author: stefanprodan

docs/spec/v1beta1/alert.md

@@ -55,6 +55,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1beta1
 kind: Alert
 metadata:
   name: webapp
+  namespace: default
 spec:
   providerRef: 
     name: on-call-slack
@@ -79,6 +80,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1beta1
 kind: Alert
 metadata:
   name: all-kustomizations
+  namespace: default
 spec:
   providerRef: 
     name: dev-msteams

docs/spec/v1beta1/event.md

@@ -53,5 +53,5 @@ const (
 )
 ```
 
-Controller implementations can use the [fluxcd/pkg/recorder](https://github.com/fluxcd/pkg/tree/master/recorder)
+Controller implementations can use the [fluxcd/pkg/runtime/events](https://github.com/fluxcd/pkg/tree/main/runtime/events)
 package to push events to notification-controller API.

docs/spec/v1beta1/provider.md

@@ -73,6 +73,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1beta1
 kind: Provider
 metadata:
   name: slack
+  namespace: default
 spec:
   type: slack
   channel: general
@@ -108,6 +109,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1beta1
 kind: Provider
 metadata:
   name: podinfo
+  namespace: default
 spec:
   # provider type can be github or gitlab
   type: github

docs/spec/v1beta1/receiver.md

@@ -76,6 +76,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1alpha1
 kind: Receiver
 metadata:
   name: github-receiver
+  namespace: default
 spec:
   type: github
   events:
@@ -100,6 +101,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1alpha1
 kind: Receiver
 metadata:
   name: gitlab-receiver
+  namespace: default
 spec:
   type: gitlab
   events:
@@ -124,6 +126,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1alpha1
 kind: Receiver
 metadata:
   name: bitbucket-receiver
+  namespace: default
 spec:
   type: bitbucket
   events:
@@ -145,6 +148,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1alpha1
 kind: Receiver
 metadata:
   name: harbor-receiver
+  namespace: default
 spec:
   type: harbor
   secretRef:
@@ -164,6 +168,7 @@ apiVersion: notification.toolkit.fluxcd.io/v1alpha1
 kind: Receiver
 metadata:
   name: generic-receiver
+  namespace: default
 spec:
   type: generic
   secretRef: