Fix typo discovered by codespell

[cclauss]

Please read the contribution guidelines and include a clear explanation of the problem, solution, and alternatives for any proposed change in behavior.

Pull requests containing LLM generated content must include a clear statement that the content was generated by an LLM, and the prompt used to generate the content. Most importantly, it must include a clear explanation of how the generated content was reviewed for accuracy and relevance. Failure to do so will result in it being closed without review.

Problem Statement

Typo exists.

Proposed Solution

Fix typo.

Alternatives Considered

Going snowboarding. 🏂

---

Fix typos discovered by codespell - https://pypi.org/project/codespell

% codespell --ignore-words-list=doesnt,ot,shouldnt,te,theres,ue,vew --skip="*.map"

./sdk/test/README.md:61: impementation ==> implementation

% codespell --ignore-words-list=doesnt,ot,shouldnt,te,theres,ue,vew --skip="*.map" --write-changes

[bencroker]

Thanks!