Fix out of date zipkin exporter docs

[jack-berg]

Resolves #4926.

[codecov]

Codecov Report

Base: 91.21% // Head: 91.24% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (cb2ff26) compared to base (7dd5c1c).
Patch coverage: 96.29% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4995      +/-   ##
============================================
+ Coverage     91.21%   91.24%   +0.02%     
- Complexity     4841     4848       +7     
============================================
  Files           548      549       +1     
  Lines         14369    14383      +14     
  Branches       1371     1373       +2     
============================================
+ Hits          13107    13124      +17     
+ Misses          873      872       -1     
+ Partials        389      387       -2     

Impacted Files	Coverage Δ
...er/zipkin/internal/ZipkinSpanExporterProvider.java	90.00% <90.00%> (ø)
...y/exporter/zipkin/OtelToZipkinSpanTransformer.java	93.10% <100.00%> (+1.10%)	⬆️
...y/sdk/autoconfigure/SpanExporterConfiguration.java	100.00% <100.00%> (+1.21%)	⬆️
...metry/sdk/logs/export/BatchLogRecordProcessor.java	90.07% <0.00%> (+0.70%)	⬆️
...metry/sdk/metrics/export/PeriodicMetricReader.java	90.00% <0.00%> (+2.85%)	⬆️

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