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### What changes were proposed in this pull request? Change the link to the Scala API document. ``` $ git grep "#org.apache.spark.package" docs/_layouts/global.html: <li><a href="api/scala/index.html#org.apache.spark.package">Scala</a></li> docs/index.md:* [Spark Scala API (Scaladoc)](api/scala/index.html#org.apache.spark.package) docs/rdd-programming-guide.md:[Scala](api/scala/#org.apache.spark.package), [Java](api/java/), [Python](api/python/) and [R](api/R/). ``` ### Why are the changes needed? The home page link for Scala API document is incorrect after upgrade to 3.0 ### Does this PR introduce any user-facing change? Document UI change only. ### How was this patch tested? Local test, attach screenshots below: Before: ![image](https://user-images.githubusercontent.com/4833765/74335713-c2385300-4dd7-11ea-95d8-f5a3639d2578.png) After: ![image](https://user-images.githubusercontent.com/4833765/74335727-cbc1bb00-4dd7-11ea-89d9-4dcc1310e679.png) Closes #27549 from xuanyuanking/scala-doc. Authored-by: Yuanjian Li <xyliyuanjian@gmail.com> Signed-off-by: Sean Owen <srowen@gmail.com>
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