docs: fix broken relative links in experimental docs

[mihhhir08]

Found three relative links in the experimental docs that point at files that don't exist.

The experimental CHANGELOG links to doc/upgrade-to-2.x.md, but the upgrade guide is at the repo root, so from experimental/ it needs to be ../doc/upgrade-to-2.x.md.

The sdk-logs README links to ./src/config.ts, which isn't there anymore. The default LoggerConfig now lives in ./src/config/LoggerConfigurators.ts so I pointed it there.

The exporter-trace-otlp-grpc README links to ./test/certs/regenerate.sh, but that package has no test/certs directory. The script is in otlp-grpc-exporter-base, which that package already depends on.

Docs only, no code changed, so I think this one needs the Skip Changelog label. markdownlint-cli2 passes on all three files.

One thing I wasn't sure about, on the sdk-logs link you might prefer pointing at src/internal/LoggerProviderSharedState.ts since that also defines a DEFAULT_LOGGER_CONFIG. Happy to switch it if that reads better.

[linux-foundation-easycla]

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• ✅ login: mihhhir08 / name: Mihirsinh Chavda (7ab9ab6, 7cbf2bb)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.97%. Comparing base (b68078d) to head (13dbbe2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7046   +/-   ##
=======================================
  Coverage   94.97%   94.97%           
=======================================
  Files         406      406           
  Lines       14269    14269           
  Branches     3272     3272           
=======================================
  Hits        13552    13552           
  Misses        717      717           

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