[DOCS-12270] Synthetic Monitoring Network Path Tests

[git-thuerk-done]

What does this PR do? What is the motivation?

New docs page for Network Path tests under Synthetic Monitoring.
GA 10/22

Merge instructions

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• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-12270-Syn-network-path/synthetics/network_path_tests/

Modified Files

• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-12270-Syn-network-path/synthetics/

[git-thuerk-done]

Editorial review card: https://datadoghq.atlassian.net/browse/DOCS-12317

[rtrieu]

left you some suggestions mainly to address a typo and shorten some sentences.