XS✔ ◾ Update rule.md - added Key vault on premise options in pros.

[Dhruv-0987]

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

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

✏️ This was pointed out in a discussion with Matt W as part of the SugarLearning item: https://my.sugarlearning.com/SSW/items/13056

2. What was changed?

✏️ Added another pro point for Key Vault - Can be used for on premise.

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

✏️ Consulted @wicksipedia

[github-actions]

PR Metrics

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

	Lines
Product Code	0
Test Code	0
Subtotal	0
Ignored Code	9
Total	9

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[github-actions]

Hi @Dhruv-0987,

We found some markdown suggestions for your Pull Request:

File	Error	Rule
rules/store-your-secrets-securely/rule.md	Line 53: should have alternate text (alt text)	Rule MD045
rules/store-your-secrets-securely/rule.md	Line 225: should have alternate text (alt text)	Rule MD045

Please review the errors and update your Markdown files accordingly.

[github-actions]

Hi @Dhruv-0987,

We found some markdown suggestions for your Pull Request:

File	Error	Rule
rules/store-your-secrets-securely/rule.md	Line 53: should have alternate text (alt text)	Rule MD045
rules/store-your-secrets-securely/rule.md	Line 225: should have alternate text (alt text)	Rule MD045

Please review the errors and update your Markdown files accordingly.