[Bug] Docstring point to wrong file/line

[haarts]

Describe the bug
This is a really trivial bug. I'm almost ashamed of submitting it.

In this example there's a reference to a file/line that no longer exists/is moved: https://github.com/TBD54566975/ssi-sdk/blob/main/example/did/did.go#L20.
I think it should point here: https://github.com/TBD54566975/ssi-sdk/blob/main/did/key/key.go#L96

To Reproduce
n/a

Expected behavior
Clearly it should point to the right place.

Supporting Material
n/a

Environment (please complete the following information):

The issue is at least present in commit 989cdd2

[andresuribe87]

Thanks @haarts ! Fix is underway. We also accept PRs :)