XS✔ ◾ Followupthen - fix bcc bit

[bradystroud]

Tip: Use SSW Rule Writer GPT for help with writing rules 🤖

1. What triggered this change? (PBI link, Email Subject, conversation + reason, etc)

✏️ convo with @sethdailyssw

2. What was changed?

✏️ make the extra bit optional

3. Did you do pair or mob programming (list names)?

✏️

[github-actions]

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✔ Thanks for keeping your pull request small.
✔ Thanks for adding tests.

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Ignored Code	1
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[github-actions]

Hi @bradystroud,

We found some markdown suggestions for your Pull Request:

File	Error	Rule
rules/follow-up-effectively/rule.md	Line 98 MD036/no-emphasis-as-heading Emphasis used instead of a heading [Context: used instead of a heading	Rule MD036
rules/follow-up-effectively/rule.md	Line 123: list item prefix	Rule MD029
rules/follow-up-effectively/rule.md	Line 129: list item prefix	Rule MD029
rules/follow-up-effectively/rule.md	Line 130: list item prefix	Rule MD029
rules/follow-up-effectively/rule.md	Line 134: list item prefix	Rule MD029
rules/follow-up-effectively/rule.md	Line 135: list item prefix	Rule MD029

Please review the errors and update your Markdown files accordingly.