Correct spelling, grammar, typographical, and Markdown lint errors in source files

Goal

The purpose of this issue is to correct spelling, grammar, typographical, and Markdown lint errors in source files.

Page

Which page is involved in this request?

• Various pages will be involved with this request as errors are found.

Requirements

What are the requirements for this request? Checklist below is an example of common requirements, please check all that apply and adjust as necessary:

• Documentation
• Technical Writing
• Illustration
• Custom Graphics
• Research
• Data / Analytics
• UX Design
• Engineering