A DESCRIPTION OF THE REQUEST :
The example in the documentation of java.util.concurrent.atomic.LongAdder:

freqs.computeIfAbsent(k -> new LongAdder()).increment();

should be:

freqs.computeIfAbsent(key, k -> new LongAdder()).increment();

JUSTIFICATION :
computeIfAbsent is a newer method that programmers may find confusing. Let's not confuse them more.