Component Lifecycle Methods: Add link to canvas element

[nik-rev]

Because

The lesson mentions the Canvas, which has not been previously covered in the curriculum, so the reader will have no idea what that is.

This PR

• Adds hyperlink to MDN's canvas api article

Issue

Closes #XXXXX

Additional Information

Pull Request Requirements

• [x] I have thoroughly read and understand The Odin Project Contributing Guide
• [x] The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• [x] The Because section summarizes the reason for this PR
• [x] The This PR section has a bullet point list describing the changes in this PR
• [x] If this PR addresses an open issue, it is linked in the Issue section
• [x] If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• [x] If any lesson files are included in this PR, they follow the Layout Style Guide

[nik-rev]

Rather than insert a link to info about Canvas, my sense is that this lesson would be better off not mentioning it at all. Is there another example we can toss in that folks would be familiar with?

I have updated the lesson and removed mention of canvas, replacing it with a reference to fetching from API instead.