java: update to latest Pull in changes: * Update the Style Guide to talk about text blocks. * Added External TODO style section in Java style guide. * Update camel-case to explain how to separate adjacent numeric words. * Adjust indentation of `// fall through` comments * Remove forward looking promises about the formatter * Updates to account for inline @return Javadoc tag. * Integrate JAKE Java 21 Documentation branch into mainline. * Remove exception from '6.2 Caught exceptions: not ignored' for tests * Add style guidance for `package-info.java` and `module-info.java` files. * Correct possibly confusing indentation of an ellipsis. PiperOrigin-RevId: 751565114