Update README.md

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## What type of PR is this? (check all applicable)

- [ ] ♻️ Refactor
- [ ] ✨ New Feature
- [ ] 🐛 Bug Fix
- [x] 📝 Documentation Update
- [ ] 👷 Example Application
- [ ] 🧑‍💻 Code Snippet
- [ ] 🎨 Design
- [ ] 📖 Content
- [ ] 🧪 Tests
- [ ] 🔖 Release
- [ ] 🚩 Other

## Description

<!-- Please do not leave this blank -->

This PR fixes typos in API Reference Guides Page and `self-sovereign` typos for consistency. 

## Related Tickets & Documents
<!-- 
Please use this format link issue numbers: Resolves #123 https://docs.github.com/en/free-pro-team@latest/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword  -->
Resolves #21 

## Mobile & Desktop Screenshots/Recordings

<!-- Visual changes require screenshots -->

## Added code snippets?
- [ ] 👍 yes
- [x] 🙅 no, because they aren't needed

## Added tests?

- [ ] 👍 yes
- [x] 🙅 no, because they aren't needed
- [ ] 🙋 no, because I need help

### No tests? Add a note
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## Added to documentation?

- [ ] 📜 readme
- [ ] 📜 contributing.md
- [ ] 📓 general documentation
- [x] 🙅 no documentation needed

### No docs? Add a note
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If you didn't provide documentation with this PR, please explain here why it's not needed. -->

## [optional] Are there any post-deployment tasks we need to perform?



## [optional] What gif best describes this PR or how it makes you feel?



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README.md

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