fix: fix wrong package name in HierarchyPackage (#4512)

Signed-off-by: unlsycn <unlsycn@unlsycn.com>

core/src/main/scala-2/chisel3/experimental/hierarchy/HierarchyPackage.scala

@@ -1,4 +1,4 @@
-package chisel3.experimental
+package chisel3.experimental.hierarchy
 
 /** Classes or traits which will be used with the [[Definition]] + [[Instance]] api should be marked
   * with the [[instantiable]] annotation at the class/trait definition.

core/src/main/scala/chisel3/experimental/hierarchy/package.scala

@@ -1,51 +1,6 @@
 package chisel3.experimental
 
 package object hierarchy {
-
-  /** Classes or traits which will be used with the [[Definition]] + [[Instance]] api should be marked
-    * with the [[instantiable]] annotation at the class/trait definition.
-    *
-    * @example {{{
-    * @instantiable
-    * class MyModule extends Module {
-    *   ...
-    * }
-    *
-    * val d = Definition(new MyModule)
-    * val i0 = Instance(d)
-    * val i1 = Instance(d)
-    * }}}
-    */
-  class instantiable extends chisel3.internal.instantiable
-
-  /** Classes marked with [[instantiable]] can have their vals marked with the [[public]] annotation to
-    * enable accessing these values from a [[Definition]] or [[Instance]] of the class.
-    *
-    * Only vals of the the following types can be marked [[public]]:
-    *   1. IsInstantiable
-    *   2. IsLookupable
-    *   3. Data
-    *   4. BaseModule
-    *   5. Iterable/Option containing a type that meets these requirements
-    *   6. Basic type like String, Int, BigInt etc.
-    *
-    * @example {{{
-    * @instantiable
-    * class MyModule extends Module {
-    *   @public val in = IO(Input(UInt(3.W)))
-    *   @public val out = IO(Output(UInt(3.W)))
-    *   ..
-    * }
-    *
-    * val d = Definition(new MyModule)
-    * val i0 = Instance(d)
-    * val i1 = Instance(d)
-    *
-    * i1.in := i0.out
-    * }}}
-    */
-  class public extends chisel3.internal.public
-
   type Instance[P] = core.Instance[P]
   val Instance = core.Instance
   type Definition[P] = core.Definition[P]