Call Live Processes product by its proper name

[robertjli]

What does this PR do? What is the motivation?

In the NPM installation docs, use the proper name for the Live Processes product in the link to its installation instructions.

Merge instructions

• [x] Please merge after reviewing

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/robertjli/npm-live-proc/network_monitoring/performance/setup