Fix README typos for adaptive sampling

[greut]

Which problem is this PR solving?

• typos spotted while reading the latest release changelog.

Description of the changes

• two small typos.

How was this change tested?

• running typos-cli locally.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[greut]

wow, I got lucky with that PR number. 🍀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.81%. Comparing base (b7e8884) to head (2c4547b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6000      +/-   ##
==========================================
+ Coverage   96.79%   96.81%   +0.01%     
==========================================
  Files         348      348              
  Lines       16559    16559              
==========================================
+ Hits        16029    16031       +2     
+ Misses        342      341       -1     
+ Partials      188      187       -1     

Flag	Coverage Δ
badger_v1	8.02% <ø> (ø)
badger_v2	1.82% <ø> (ø)
cassandra-4.x-v1	16.61% <ø> (ø)
cassandra-4.x-v2	1.75% <ø> (ø)
cassandra-5.x-v1	16.61% <ø> (ø)
cassandra-5.x-v2	1.75% <ø> (ø)
elasticsearch-6.x-v1	18.78% <ø> (ø)
elasticsearch-7.x-v1	18.84% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v1	19.04% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v2	1.82% <ø> (+0.01%)	⬆️
grpc_v1	9.52% <ø> (+0.01%)	⬆️
grpc_v2	7.15% <ø> (ø)
kafka-v1	9.74% <ø> (ø)
kafka-v2	1.82% <ø> (ø)
memory_v2	1.81% <ø> (ø)
opensearch-1.x-v1	18.88% <ø> (-0.02%)	⬇️
opensearch-2.x-v1	18.88% <ø> (-0.02%)	⬇️
opensearch-2.x-v2	1.81% <ø> (-0.02%)	⬇️
tailsampling-processor	0.46% <ø> (ø)
unittests	95.29% <ø> (+0.01%)	⬆️

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