docs: small grammar change

[codyroberts]

Overview

Small grammar fix in the $ symbol section about the optimizer.

What is it?

• [ ] Feature / enhancement
• [ ] Bug
• [x] Docs / tests / types / typos

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Use cases and why

• 1. Improves readability

Checklist:

• [x] My code follows the developer guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [ ] Added new tests to cover the fix / functionality

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