Wrong class name for SVIF and missing entry on index page

[Aqwyh123]

The class name of SVIF is incorrect. It should be Interface.

And there is no entry on the index page.

[mrcmry]

Thanks !

I did my best to correct the doc in in #308. I don't use SV nor Interface. If it's your case, could you please look at the PR and add comments of things that are wrong in the commentary ?

Also do you think with scaladoc in the code is correct ?

/** system verilog interface
  * 
  * ==Example==
  *{{{
  * case class MyIf(width: Int = 8) extends Interface with IMasterSlave {
  *  val wParam = addGeneric("WIDTH", width, default = "8")
  *  val a = Bits(width bits)
  *  tieGeneric(a, wParam)
  *  val b = Bool()
  *  val c = SInt(8 bits)
  *
  *  override def asMaster = mst
  *  @modport
  *  def mst = {
  *    out(a, b, c)
  *  }
  *
  *  @modport
  *  def slv = {
  *    in(a, b, c)
  *  }
  *
  *}
  *}}}
  *
  */
class Interface extends Bundle {