8220248: fix headings in java.util.concurrent
minor improvements
code sample modernization
standardize code sample idiom: * <pre> {@code
improve docs for scheduleAtFixedRate and scheduleWithFixedDelay
doclint warning fixes
add missing <p>
javadoc link readability
<tt> -> {@code
normalize whitespace after <p>
clean up imports
Update Creative Commons license URL in legal notices
Fix javadoc code samples to use <pre> {@code so that we can replace < with <, etc.
Sync with OpenJDK; untabify
javadoc style cleanup
whitespace
doc fixes
Clarrify scheduleAtFixedRate spec
Documentation improvements
Javadoc fixes
formatting; grammar
Document toString
Added usage example
Javadoc improvements
Headers reference Creative Commons
Simplify FutureTask and AbstractExecutorService internals; improve docs
Documentation improvements
Documentation improvements
Move and rename static Executors.execute/invoke to ExecutorService.submit/invoke, providing implementations in AbstractExecutorService (which TPE extends).
ScheduledExecutorService for Executors factory method return type
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