Cross-module HTML links break with package names containing an uppercase character

[OliverO2]

Describe the bug With currently unpublished changes for TestBalloon, Dokka produced a link

• from dokka/html/testBalloon-framework-core/de.infix.testBalloon.framework.core/-test/index.html
• to dokka/html/testBalloon-framework-shared/de.infix.test-balloon.framework.shared/-abstract-test/index.html.

(Note the uppercase conversion for the package name).

However, the target document resides at a URL without the uppercase conversion for the package name:

• dokka/html/testBalloon-framework-shared/de.infix.testBalloon.framework.shared/-abstract-test/index.html

Expected behaviour HTML links don't break in the presence of uppercase characters in package names.

Notable, intra-module links work with uppercase characters.

The Kotlin coding conventions state (emphasis added):

Names of packages are always lowercase and do not use underscores (org.example.project). Using multi-word names is generally discouraged, but if you do need to use multiple words, you can either just concatenate them together or use camel case (org.example.myProject).