Describe the bug
the source link is missing in case a function has overloads

Expected behaviour
one source link per function

To Reproduce
see for instance https://robstoll.github.io/niok/kdoc/niok/ch.tutteli.niok/copy-to.html

Dokka configuration
https://github.com/robstoll/niok/blob/master/build.gradle.kts#L43

Installation

• Build tool: Gradle v7.1.1
• Dokka version: 1.5.0

Additional context
Add any other context about the problem here

Are you willing to provide a PR?
Yes, if you can give me a pointer where to start