Kotlin/dokka v1.6.20 on GitHub

Features

Introduce documentedVisibilities setting that allows including/excluding any visibility modifier in documentation. This is a more flexible replacement for includeNonPublic, which has now been deprecated (#2270)
Make HTML pages customizable through FreeMarker HTML templates (#2374)
Add global settings to JSON dokka CLI input (#2292), thanks to @BarkingBad!

Add vertical alignment (wrapping) of signatures when 3 and more parameters are present (#2309)
Enhance primary constructor signature, display val/var keywords and default values (#2313)
Add a level of indentation to childless items in navigation tree (#2291)
Add horizontal margin to breadcrumbs delimiter (#2285)
Fixed various CSS rendering issues (#2284, #2389)

Fixed OutOfMemoryError: Metaspace-related issues for the majority of cases (#2216)
Fixed classpath issues for HMPP libraries (#2431)
Using @ symbol within code blocks in .md files doesn't lead to cropped documents anymore (#2418)
Fixed incorrect placement of HTML head tags, which led to missing favicon in multi-module projects (#2365)
Fixed resolution of ultralight methods that led to flaky signature generation (#2400)
Coroutines dispatchers are now shut down after each module pass to avoid resource leaks (#2325)
Suppressed property setters are now excluded from documentation (#2220)
Suppressing extensions doesn't fail builds anymore (#2348), thanks to @BarkingBad!
Fixed java getter / setter name generation for kotlin-java interop, now isBoolean instead of getBoolean (#2356), thanks to @CharlesG-Branch!
Fixed MathJax plugin, previously completely broken (#2342), thanks to @wyskoj!
Fixed Input/Output streams to minimize resource leaks (#2312, #2319)

Add an extension point for rendering custom documentation tags (#2343)
Add an extension point for an external documentable provider (#2307), thanks to @Kordyjan!
Add filtering stategies extension point and fix constructors in Kotlin-as-Java (#2277), thanks to @BarkingBad!
Expose Kotlin-as-Java methods that could be used not only as part of transformers (#2351), thanks to @BarkingBad!
Refactor Ancestry Graphs (#2326), thanks to @BarkingBad!
Fixed resolving of DRIs for Enum Entries (#2305), thanks to @BarkingBad!

Collect annotations from package-info.java (#2331), thanks to @ember-rose!
Add support for header tags (<h1> / <h2> / <h3>) in Javadoc (#2345), thanks to @asfalcone!
Add an option to merge implicit expect-actual declarations, enables merging of pages for related declarations which are not connected via expect-actual keywords (#2316)
Add a note about using Dokka in a precompiled script plugin (#2303), thanks to @chkpnt!
Fixed wrong Groovy DSL example (#2302), thanks to @chkpnt!
Various code cleanups (#2165, #2360, #2364, #2385), thanks to @Goooler!

Kotlin Multiplatform projects that use .klib libraries may experience problems. There will be a separate 1.6.21 release that will address this issue shortly.