Fix pubusb quickstart links

Signed-off-by: Nick Greenfield <nigreenf@microsoft.com>

daprdocs/content/en/developing-applications/building-blocks/pubsub/howto-publish-subscribe.md

@@ -698,7 +698,7 @@ Invoke-RestMethod -Method Post -ContentType 'application/cloudevents+json' -Body
 
 ## Next steps
 
-- Try the [Pub/Sub quickstart sample](https://github.com/dapr/quickstarts/tree/master/pub-sub)
+- Try the [Pub/Sub quickstart sample](https://github.com/dapr/quickstarts/tree/master/pub_sub)
 - Learn about [PubSub routing]({{< ref howto-route-messages >}})
 - Learn about [topic scoping]({{< ref pubsub-scopes.md >}})
 - Learn about [message time-to-live]({{< ref pubsub-message-ttl.md >}})

daprdocs/content/en/developing-applications/building-blocks/pubsub/pubsub-overview.md

@@ -112,7 +112,7 @@ The publish/subscribe API is located in the [API reference]({{< ref pubsub_api.m
 * Follow these guides on:
     * [How-To: Publish a message and subscribe to a topic]({{< ref howto-publish-subscribe.md >}})
     * [How-To: Configure Pub/Sub components with multiple namespaces]({{< ref pubsub-namespaces.md >}})
-* Try out the [Pub/Sub quickstart sample](https://github.com/dapr/quickstarts/tree/master/pub-sub)
+* Try out the [Pub/Sub quickstart sample](https://github.com/dapr/quickstarts/tree/master/pub_sub)
 * Learn about [topic scoping]({{< ref pubsub-scopes.md >}})
 * Learn about [message time-to-live (TTL)]({{< ref pubsub-message-ttl.md >}})
 * Learn about [pubsub without CloudEvent]({{< ref pubsub-raw.md >}})

daprdocs/content/en/operations/components/setup-pubsub/_index.md

@@ -47,7 +47,7 @@ Visit [this guide]({{< ref "howto-publish-subscribe.md#step-3-publish-a-topic" >
 ## Related links
 
 - Overview of the Dapr [Pub/Sub building block]({{< ref pubsub-overview.md >}})
-- Try the [Pub/Sub quickstart sample](https://github.com/dapr/quickstarts/tree/master/pub-sub)
+- Try the [Pub/Sub quickstart sample](https://github.com/dapr/quickstarts/tree/master/pub_sub)
 - Read the [guide on publishing and subscribing]({{< ref howto-publish-subscribe.md >}})
 - Learn about [topic scoping]({{< ref pubsub-scopes.md >}})
 - Learn about [message time-to-live]({{< ref pubsub-message-ttl.md >}})

daprdocs/content/en/operations/components/setup-pubsub/pubsub-namespaces.md

@@ -12,7 +12,7 @@ In some scenarios, applications can be spread across namespaces and share a queu
 Namespaces are a Dapr concept used for scoping applications and components. This example uses Kubernetes namespaces, however the Dapr component namespace scoping can be used on any supported platform. Read [How-To: Scope components to one or more applications]({{< ref "component-scopes.md" >}}) for more information on scoping components.
 {{% /alert %}}
 
-This example uses the [PubSub sample](https://github.com/dapr/quickstarts/tree/master/pub-sub). The Redis installation and the subscribers are in `namespace-a` while the publisher UI is in `namespace-b`. This solution will also work if Redis is installed on another namespace or if you use a managed cloud service like Azure ServiceBus, AWS SNS/SQS or GCP PubSub.
+This example uses the [PubSub sample](https://github.com/dapr/quickstarts/tree/master/pub_sub). The Redis installation and the subscribers are in `namespace-a` while the publisher UI is in `namespace-b`. This solution will also work if Redis is installed on another namespace or if you use a managed cloud service like Azure ServiceBus, AWS SNS/SQS or GCP PubSub.
 
 This is a diagram of the example using namespaces.
 
@@ -33,7 +33,7 @@ The table below shows which resources are deployed to which namespaces:
 ## Pre-requisites
 
 * [Dapr installed on Kubernetes]({{< ref "kubernetes-deploy.md" >}}) in any namespace since Dapr works at the cluster level.
-* Checkout and cd into the directory for [PubSub quickstart](https://github.com/dapr/quickstarts/tree/master/pub-sub).
+* Checkout and cd into the directory for [PubSub quickstart](https://github.com/dapr/quickstarts/tree/master/pub_sub).
 
 ## Setup `namespace-a`
 

daprdocs/content/en/reference/api/pubsub_api.md

@@ -168,4 +168,4 @@ Dapr Pub/Sub adheres to version 1.0 of CloudEvents.
 ## Related links
 
 * [How to publish to and consume topics]({{< ref howto-publish-subscribe.md >}})
-* [Sample for pub/sub](https://github.com/dapr/quickstarts/tree/master/pub-sub)
+* [Sample for pub/sub](https://github.com/dapr/quickstarts/tree/master/pu_sub)