Probably not the best way to phrase it, but say you have the following comment:
"To convert a symbol to a list, check out the [s2l] object."
When you right-click on the text "[s2l]", it would be helpful if the menu had an additional option to get help for the [s2l] object.
This would solve the problem of how to safely refer to externals in the "Related Objects" section of help docs, while still providing links to their respective help patches.
If the [s2l] object does not exist, pd could open a kind of generic 404-error help patch giving the common reasons why pd can't find the object (e.g., typo, library not loaded, not available on a particular os, etc.).