docs(js): document browser service name configuration

[LarryHu0217]

Fixes #5043

Changes

• configure service.name explicitly in both browser getting-started provider examples using the current resource API
• include the resource and semantic-conventions packages required by those examples
• clarify that OTEL_* environment-variable configuration applies to Node.js and link to the browser setup

Validation

• npm run check:format
• npm run check:markdown
• npm run check:spelling
• npm run check:text
• npm run build:lean
• inspected the rendered internal link and target anchor

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Status last refreshed: 2026-07-26 01:01:21 UTC.

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