[Term Entry] Dart Type Conversion .toStringAsFixed()

[codecademy-docs]

Reason/inspiration (optional)

We would like a new term entry under Dart for the Dart Type Conversion .toStringAsFixed() method.
Provide the entry in a markdown file under docs/content/dart/concepts/type-conversion/terms/toStringAsFixed/toStringAsFixed.md

The entry should

• Have an introductory paragraph about what the method is and does.
• A syntax section with a pseudo code block with an explanation of it.
• An example showing the method in use.

Please refer to the entry templates, content standards, and markdown style guide when working on the PR for this issue.

Entry Type (select all that apply)

New Term for Existing Concept Entry

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[alvaro347]

Hello, I am interested in taking this term entry issue.

[ishg-153]

@alvaro347 You're assigned!🎉You can look through the Contribution Guide to know more about contributing to Codecademy Docs. Check out the Content Standards and Style Guide, they’ll help you with creating your entry.

I see this is your first time contributing to Codecademy Docs. How did you find out about us?

[alvaro347]

Hello @ishg-153 thank you! I'm already working on it.

I was going through the "Web Development" skill path from CodeCademy, and this is one of the portfolio projects.