8231186: Replace html tag <code>foo</code> with javadoc tag {@code foo} in java.base
Summary: Minor coding style update of javadoc tag in any file in java.base
Reviewed-by: bchristi, lancea
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
(^|/)\.DS_Store
(^|/)\.metadata/
(^|/)\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
(^|/)JTreport/
(^|/)JTwork/
(^|/)\.git/
^src/utils/hsdis/build/