chore(README): update link to BatchSpanProcessor in sdk node

[pragmaticivan]

Which problem is this PR solving?

Fixes a broken link to BatchSpanProcessor in sdk node README.md

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Ivan Santos (d2e8b52)

[codecov]

Codecov Report

Merging #2300 (91c0e19) into main (de6cee9) will increase coverage by 0.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2300      +/-   ##
==========================================
+ Coverage   92.09%   92.74%   +0.65%     
==========================================
  Files         125      145      +20     
  Lines        4085     5182    +1097     
  Branches      836     1059     +223     
==========================================
+ Hits         3762     4806    +1044     
- Misses        323      376      +53     

Impacted Files	Coverage Δ
...lemetry-exporter-collector/src/transformMetrics.ts	95.71% <0.00%> (ø)
...mentation-xml-http-request/src/enums/EventNames.ts	100.00% <0.00%> (ø)
...es/opentelemetry-context-zone-peer-dep/src/util.ts	100.00% <0.00%> (ø)
packages/opentelemetry-web/src/utils.ts	94.80% <0.00%> (ø)
...ontext-async-hooks/src/AsyncHooksContextManager.ts	100.00% <0.00%> (ø)
...ry-context-zone-peer-dep/src/ZoneContextManager.ts	85.18% <0.00%> (ø)
...async-hooks/src/AsyncLocalStorageContextManager.ts	100.00% <0.00%> (ø)
...kages/opentelemetry-web/src/StackContextManager.ts	97.05% <0.00%> (ø)
...ation-xml-http-request/src/enums/AttributeNames.ts	100.00% <0.00%> (ø)
...sync-hooks/src/AbstractAsyncHooksContextManager.ts	97.01% <0.00%> (ø)
... and 10 more