* Clarify behavior of LIBSVM in XGBoost4J-Spark (#3524) * Fix typo in faq.rst (#3521) * Fix typo in parameter.rst, gblinear section (#3518) * Clarify supported OSes for XGBoost4J published JARs (#3547) * Update broken links (#3565) * Grammar fixes and typos (#3568) * Bring XGBoost4J Intro up-to-date (#3574)