ddtrace/tracer: add link to Service page and Inferred Services

[darccio]

What does this PR do?

Adds a link to the corresponding documentation for WithPeerServiceDefaults.

Motivation

Improve Go docs.

Reviewer's Checklist

• [ ] Changed code has unit tests for its functionality at or near 100% coverage.
• [ ] System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• [ ] There is a benchmark for any new code, or changes to existing code.
• [ ] If this interacts with the agent in a new way, a system test has been added.
• [ ] Add an appropriate team label so this PR gets put in the right place for the release notes.
• [ ] Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

For Datadog employees:

• [ ] If this PR touches code that handles credentials of any kind, such as Datadog API keys, I've requested a review from @DataDog/security-design-and-guidance.
• [ ] This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2024-02-22 14:41:03

Comparing candidate commit 4f3550d3435c9cb57161a4a8b7ef6fd22716bcfc in PR branch dario.castane/AIT-9179/add-link-peer.service with baseline commit 1dfe613829ccaae5aa301d2314358d558ba575cc in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 39 metrics, 2 unstable metrics.

[github-actions[bot]]

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