Improve Clarity and Consistency in Style Guide

**Description**:
There are a few areas in the style guide that could be improved for clarity and consistency. Below are the suggested changes:

#### 1. Spacing Around Em Dashes
- The guide uses em dashes without consistent spacing around them. For example, in the sentence:
- "The length of the text on the first line before the em dash will break to the second line of text."
- **Suggestion**: Add space around em dashes for improved readability:
- "…will break to the second line — of text."

#### 2. Comma Usage in Lists
- The guide states: "Don’t use the Oxford comma," but also provides an example where it is used.
- **Suggestion**: Ensure consistency in the use of the Oxford comma throughout the document. Either avoid it entirely, or use it consistently.

#### 3. Clarify Numerals Section
- The section about abbreviating large numbers could benefit from more explicit clarification. For example:
- "Use 'K' for thousands (e.g., 10K for 10,000), 'M' for millions, and 'B' for billions."
- **Suggestion**: Rewrite to make the usage of these abbreviations more clear.

#### 4. General Formatting Consistency
- Ensure that all formatting (such as headings, subheadings, and bullet points) is consistent across the document for better readability.