Forms documentation: remove duplicate opening tag from html sample

This fixes identical errors in both the Java and Scala documentation.
Merge pull request #1211 from stig/patch-1

Forms documentation: remove duplicate opening tag from html sample
Changed the Play group id so that we can upload to Maven Central
Merge pull request #1215 from huntc/com-typesafe-play

Rename GroupId to “com.typesafe.play”
flip parameter order

https://issues.scala-lang.org/browse/SI-6481
Merge pull request #1226 from xuwei-k/request/flip-param-SI-6481

flip parameter order
Update ProductionConfiguration.md
Update ProductionConfiguration.md
Change the select to support multiple
In toHtmlArgs when the value is None only write the symbol