Remove jaeger crate from tracing example deps

[cijothomas]

Towards #995

Changes

Removed unwanted dependency from example. The example was already using OTLPExporter!
Minor wording change to indicate opentelemetry-jaeger is to be used for jaeger propagators, not for exporters.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6e1c8c1) 57.2% compared to head (324df6b) 57.2%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1393   +/-   ##
=====================================
  Coverage   57.2%   57.2%           
=====================================
  Files        146     146           
  Lines      18128   18128           
=====================================
  Hits       10371   10371           
  Misses      7757    7757           

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