A link checker found the following broken link that looks like a typo:

api/java.base/java/util/doc-files/coll-reference.html:401: id not found: api/java.base/java/util/Collections.html#copy-java.util.List(java.util.List)

This appears to be the correct link:

<a id="copy(java.util.List,java.util.List)">

This is part of the noise that is getting in the way of achieving a goal of no broken links.

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More problems from the link checker in the collections API docs:

api/serialized-form.html:21540: id not found: api/java.base/java/util/List.html#immutable
api/serialized-form.html:21541: id not found: api/java.base/java/util/Map.html#immutable
api/serialized-form.html:21542: id not found: api/java.base/java/util/Set.html#immutable

The offending source seems to be these references in ImmutableCollections.java
     * <a href="List.html#immutable">List</a>,
     * <a href="Map.html#immutable">Map</a>, or
     * <a href="Set.html#immutable">Set</a>.
It really does appear to be the case that there is no anchor named "immutable" in each of these classes.

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Also:
open/src/java.base/share/classes/java/util/EnumSet.java: * <a href="../../serialized-form.html#java.util.EnumSet.SerializationProxy">
This either needs an extra ../ or (preferenbly) replace the existing `../../` by `{@docRoot}/`