Clearly document how to disable placement connection on non-actor services

[KrylixZA]

Describe the issue

On the page: Dapr arguments and annotations for daprd, CLI, and Kubernetes, it specifies

When the annotation is set and the value is empty, the sidecar does not connect to Placement server. This can be used when there are no actors running in the sidecar.

However it is not completely clear that the value needs to be a single space. Simply putting '' does not work. It needs to be set to ' ' for this to work.

URL of the docs
https://docs.dapr.io/reference/arguments-annotations-overview/

Expected content
The docs should explicitly state that it needs to be set to ' ' in order for it to work and specify this needs to be a single space character.

Screenshots
N/A

Additional context
This is for those wanting to get rid of the 404 /dapr/config issues in their telemetry during application startup.

[KrylixZA]

This does seem to be largely a Helm thing, not a Dapr thing. But it's worth putting in the docs.

[msfussell]

@KrylixZA Were you setting this annotation via Helm or some other way? Making sure our guidance for the approach is consistent.

[KrylixZA]

@msfussell Yeah using Helm to set pod annotations.