RFR: Fix HTML 5 errors in various langtools modules

[Jonathan Gibbons]

compiler-dev, javadoc-dev, kulla-dev folk,

Please review the following collections of trivial changes to make the 
API for these modules HTML 5 compliant.

JBS:
     https://bugs.openjdk.java.net/browse/JDK-8179299
     https://bugs.openjdk.java.net/browse/JDK-8179300
     https://bugs.openjdk.java.net/browse/JDK-8179301
     https://bugs.openjdk.java.net/browse/JDK-8179303

Webrev:
http://cr.openjdk.java.net/~jjg/8179299-8179300-8179301-8179303/webrev.00/

-- Jon