doc: cleaning up

### Create gauges on the fly

The easiest way to submit data to FnordMetric are zero-config gauges. These

The easiest way to submit data to FnordMetric is to use zero-config gauges. These

are very similar to counters in Statsd: you don't have to create the gauges

upfront, they are automatically created as you send events. These events have

to follow a strict schema:

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