Clarify statsd receiver use case description

[dyladan]

Component(s)

receiver/statsd

Describe the issue you're reporting

The following line is not clear to me:

Use case: it does not support horizontal pool of collectors. Desired work case is that customers use the receiver as an agent with a single input at the same time.

This seems to be saying that a collector with statsd receiver should run on the same host as a process which emits statsd metrics (this is how I interpret the term "agent"), and have a one-to-one relationship with that process (single input)? The part about not supporting a horizontal pool seems clear that a process should send all of its statsd traffic to a single collector and NOT load balance across multiple.

[github-actions[bot]]

Pinging code owners:

• receiver/statsd: @jmacd @dmitryax

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