8177789: fix collections framework links to point to java.util package doc
Reviewed-by: bchristi, martin

8133188: docs: replace <tt> tags (obsolete in html5) for java.util
Reviewed-by: martin

8050091: (coll) LinkedList has incorrect implementation comment
Summary: Rework implementation invariant comments
Reviewed-by: igerasim

8056951: pico-optimize contains(Object) methods
Summary: use idiiom >= 0 consistently to check for valid index
Reviewed-by: mduigou

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com