ref(ds): Specify how the DSC is interpreted in Relay

[Dav1dde]

DESCRIBE YOUR PR

Adds more information how the DSC is interpreted and applied in Relay.

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[shellmayr]

I'm not sure what "Requires DSC" meas in this case, can we be more specific what the condition here is?

[Dav1dde]

Payload requires DSC, is that better? 🤔

[shellmayr]

I think this would be easier to parse if we inline the descriptions into the list, and make the headers bold.

Suggested change

	1. No dynamic sampling context.
	2. A dynamic sampling context originating in a project of the same organization.
	3. A dynamic sampling context originating in a project of a different organization or an unknown project.
	If an envelope received by Relay does not contain a dynamic sampling context it is always sampled, unless the payload requires a DSC to always be present.
	A dynamic sampling context which originates from either the same project or a project within the same organization is considered valid and Relay will apply the sampling rules from the root project as described in the previous section.
	DSCs originating in different organizations or unknown projects are discarded and Relay will re-compute a DSC based on the data of the payload and scoped to the current project. The computed dynamic sampling context is then used to apply the dynamic sampling rules.
	1. **No dynamic sampling context**: If an envelope received by Relay does not contain a dynamic sampling context it is always sampled, unless the payload requires a DSC to always be present.
	2. **A dynamic sampling context originating in a project of the same organization**: A dynamic sampling context which originates from either the same project or a project within the same organization is considered valid and Relay will apply the sampling rules from the root project as described in the previous section.
	3. **A dynamic sampling context originating in a project of a different organization or an unknown project**: DSCs originating in different organizations or unknown projects are discarded and Relay will re-compute a DSC based on the data of the payload and scoped to the current project. The computed dynamic sampling context is then used to apply the dynamic sampling rules.