Function.count() docs/API clarification

@blake.meike I noticed this comment

Null expression is count *

was added to the Function.count() API docs in CBL v3. The parameter was marked @Nullable in the same commit. However, it was reverted to @NonNull again in this commit a couple hours later.

Is the comment no longer relevant, or should the parameter actually be nullable?

I compared the API in Swift and the parameter is non-null there.

Merge conflict. The comment is correct and the annotation is wrong. Another good catch.

Opened https://issues.couchbase.com/browse/CBL-3339 to fix this.

Should be in the 3.1 build by the end of the day.

Great, seems like it needs to be updated as nullable in the other language SDKs as well.