8176266: Make visitUnknown specification more explicit
Reviewed-by: jlahoda

8175786: Fix small doc issues
Reviewed-by: jjg, jlahoda

8172686: Use less aggressive deprecation of utility visitors
Reviewed-by: jjg, smarks

8172531: Correct misstatements in javax.lang.model visitor documentation
Reviewed-by: jjg

8160506: Use @implSpec tags in javax.lang.model.util
Reviewed-by: jjg

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