Add field grouping ScalaDoc for other subclasses of Bundle (#2214)

* Add field grouping scaladocs for DecoupledIo

* Added groupdesc to DecoupledIO

* Added groupings for IrrevocableIO

* Add groupings for ValidIO

* Add field grouping scaladoc for PRNGIO

* Add field grouping scaladoc for QueueIO

* Added groupings for PipeIO

* Update src/main/scala/chisel3/util/Decoupled.scala

Commited Sugestion

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Decoupled.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Decoupled.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Decoupled.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Decoupled.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Valid.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Valid.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

* Update src/main/scala/chisel3/util/Valid.scala

Co-authored-by: Megan Wachs <megan@sifive.com>

Co-authored-by: Megan Wachs <megan@sifive.com>