spark git commit: [SPARK-5608] Improve SEO of Spark documentation pages

Repository: spark Updated Branches: refs/heads/branch-1.3 c22ccc07c - de112a209 [SPARK-5608] Improve SEO of Spark documentation pages - Add meta description tags on some of the most important doc pages - Shorten the titles of some pages to have more relevant keywords; for example there's no

spark git commit: [SPARK-5608] Improve SEO of Spark documentation pages

Repository: spark Updated Branches: refs/heads/master c4b1108c3 - 4d74f0601 [SPARK-5608] Improve SEO of Spark documentation pages - Add meta description tags on some of the most important doc pages - Shorten the titles of some pages to have more relevant keywords; for example there's no