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docs: use global dedup flag in vmagent's FlexibleDeduplication docs

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Current doc is using per-url deduplication, and users might use this example
when they have more than 1 remoteWrite URL. Which would result into extra resource usage.
Changing the example to use global dedup, as it makes more sense.

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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@ -267,16 +267,17 @@ There is also support for multitenant writes. See [these docs](#multitenancy).
for the collected samples. Examples:
- The following command instructs `vmagent` to send only the last sample per each seen [time series](https://docs.victoriametrics.com/keyconcepts/#time-series) per every 60 seconds:
```
./vmagent -remoteWrite.url=http://remote-storage/api/v1/write -remoteWrite.streamAggr.dedupInterval=60s
```sh
./vmagent -remoteWrite.url=http://remote-storage/api/v1/write -streamAggr.dedupInterval=60s
```
- The following command instructs `vmagent` to merge [time series](https://docs.victoriametrics.com/keyconcepts/#time-series) with different `replica` label values
and then to send only the last sample per each merged series per ever 60 seconds:
```
./vmagent -remoteWrite=http://remote-storage/api/v1/write -streamAggr.dropInputLabels=replica -remoteWrite.streamAggr.dedupInterval=60s
and then to send only the last sample per each merged series per every 60 seconds:
```sh
./vmagent -remoteWrite=http://remote-storage/api/v1/write -streamAggr.dropInputLabels=replica -streamAggr.dedupInterval=60s
```
## SRV urls
If `vmagent` encounters urls with `srv+` prefix in hostname (such as `http://srv+some-addr/some/path`), then it resolves `some-addr` [DNS SRV](https://en.wikipedia.org/wiki/SRV_record)