docs: fix annotation variable spelling

[pedrokohler]

Context

Documentation was wrong in many parts, using the variable annotations which does not exist in the @cornerstonejs/tools lib. Fixing docs to use the correct variation annotation.

Also the property styles was fixed to the correct one style in some parts and the setToolGroupToolStyle function was correct to setToolGroupToolStyles.

Changes & Results

Testing

Checklist

PR

• [] My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments,
  etc.)

• [] I have run the yarn build:update-api to update the API documentation, and have
  committed the changes to this PR. (Read more here https://www.cornerstonejs.org/docs/contribute/update-api)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• [] "OS:
• [] "Node version:
• [] "Browser:

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