Time Complexity: Fix subject-verb agreement in introduction section

[Maddily]

Because

The subject "requirements" is plural, so the verb should be "grow" instead of "grows."

This PR

Fixes subject-verb agreement in introduction section by changing "even as the requirements for it grows" to "even as the requirements for it grow."

Issue

Closes #XXXXX

Additional Information

N/A

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• 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
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[MaoShizhong]

Thanks for the grammar fix. To appease the linter, could you put a backslash before each of the * on lines 224 and 228 to escape them? Currently they're unescaped and the linter sees them as emphasis markers instead of plain asterisks.

[Maddily]

Done