fix: Align code.function.name description with OTel

[alexander-alderman-webb]

Description

Align the description with OTel to make it explicit that the attribute holds the fully qualified name: https://opentelemetry.io/docs/specs/semconv/registry/attributes/code/

The deprecation reason of the code.function.namespace attribute is that the code.function.name attribute should include the namespace, implying that the value of code.function.name is a qualified function name.

Looks like a copypasta mistake as the code.function.name description was copied from the code.function description.

PR Checklist

• I have run yarn test and verified that the tests pass.
• I have run yarn generate to generate and format code and docs.

If an attribute was added:

• The attribute is in a namespace (e.g. nextjs.function_id, not function_id)
• I have used the correct value for pii (i.e. maybe or true. Use false only for values that should never be scrubbed such as IDs)

If an attribute was deprecated:

• I've followed the policies described in CONTRIBUTING.md

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• (attributes) Add device.low_power_mode attribute for iOS by itaybre in #314

Bug Fixes 🐛

• Align code.function.name description with OTel by alexander-alderman-webb in #335

• Backfill several deprecated attributes by loewenheim in #332

Internal Changes 🔧

• (attributes) Mark deprecated gen_ai and ai attributes as backfill by vgrozdanic in #333
• (deps) Bump astro from 6.0.2 to 6.1.6 in /docs by dependabot in #330

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