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

• [x] I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• [x] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6000/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | Coverage Δ | | |---|---|---| | [badger_v1](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6000/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `8.02% <ø> (ø)` | | | [badger_v2](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6000/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `1.82% <ø> (ø)` | | | 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