Update links to packages moved to experimental

[jessitron]

Which problem is this PR solving?

These links were broken in the doc

Short description of the changes

I found in git log that the referenced packages were moved. So here are the links to point to their new location.

The line numbers referenced in the links aren't all quite right anymore, but at least the links take you into the right file now.

[codecov]

Codecov Report

Merging #2478 (da0187d) into main (bebd82a) will increase coverage by 1.12%.
The diff coverage is n/a.

❗ Current head da0187d differs from pull request most recent head ff4bb09. Consider uploading reports for the commit ff4bb09 to get more accurate results

@@            Coverage Diff             @@
##             main    #2478      +/-   ##
==========================================
+ Coverage   93.20%   94.32%   +1.12%     
==========================================
  Files         137       96      -41     
  Lines        5017     3347    -1670     
  Branches     1060      717     -343     
==========================================
- Hits         4676     3157    -1519     
+ Misses        341      190     -151     

Impacted Files	Coverage Δ
...emetry-api-metrics/src/platform/node/globalThis.ts	0.00% <0.00%> (-100.00%)	⬇️
...kages/opentelemetry-sdk-metrics-base/src/Metric.ts
...elemetry-sdk-metrics-base/src/SumObserverMetric.ts
...ckages/opentelemetry-sdk-metrics-base/src/Utils.ts
...try-sdk-metrics-base/src/export/aggregators/Sum.ts
...y-sdk-metrics-base/src/export/aggregators/index.ts
...elemetry-instrumentation-grpc/src/grpc-js/index.ts
...lemetry-sdk-metrics-base/src/BaseObserverMetric.ts
...ry-instrumentation-grpc/src/grpc-js/clientUtils.ts
...telemetry-sdk-metrics-base/src/export/Processor.ts
... and 32 more