Pre-release javadoc fixes

PiperOrigin-RevId: 309456095

Add an easier-to-download link to intellij-java-google-style.xml. (go…

…ogle#330)

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=227700145

1.6 release

1.5 release

1.4 release

1.3 release

1.2 release

1.1 release

1.0 release

[release] Bump versions to prep for release