Fix several AsciiDoc errors/warnings/debug problems

[ptziegler]

layoutmanagers/index.asciidoc

• table missing leading separator

faq.asciidoc

• unterminated table block

userinterface/palette.asciidoc

• section title out of sequence: expected levels 0 or 1, got level 2

userinterface/property_editor_image.asciidoc

• unknown style for listing block: java