add `namespace::` reminder

[avallecam]

Pending addition

• to forecast episode
• to severity episode

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alternatives

• Add to the first episode within the repository as a unique reminder or
• to the setup
• to additional page to render internally

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### The double-colon

The double-colon `::` in R let you call a specific function from a package without loading the entire package into the current environment. 

For example, `dplyr::filter(data, condition)` uses `filter()` from the `{dplyr}` package.

This help us remember package functions and avoid namespace conflicts.

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