Document use of atomic wrapper (#781)

Document how to use `sponge` to atomic update textfiles.
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These scripts are examples to be used with the Node Exporter Textfile
Collector.
To use these scripts, we recommend using a `sponge` to atomically write the output.
<collector_script> | sponge <output_file>
Sponge comes from [moreutils](https://joeyh.name/code/moreutils/)
* [brew install moreutils](http://brewformulas.org/Moreutil)
* [apt install moreutils](https://packages.debian.org/search?keywords=moreutils)
For more information see:
https://github.com/prometheus/node_exporter#textfile-collector