Fixed documentation

Description:
    - Updated the description of copy constructor for clarification.
    - Removed unnecessary comments.
Platforms tested:
    Linux/64 (jelly)

c++/src/H5IdComponent.h

@@ -60,21 +60,8 @@ class H5_DLLCPP IdComponent {
         // Sets the identifier of this object to a new value.
         void setId(const hid_t new_id);
 
-        // *** Deprecation warning ***
-        // The following two constructors are no longer appropriate after the
-        // data member "id" had been moved to the sub-classes.
-        // The copy constructor is a noop and is removed in 1.8.15 and the
-        // other will be removed from 1.10 release, and then from 1.8 if its
-        // removal does not raise any problems in two 1.10 releases.
-
-        // Creates an object to hold an HDF5 identifier.
-        // IdComponent(const hid_t h5_id); - removed from 1.10.1
-
 #ifndef DOXYGEN_SHOULD_SKIP_THIS
 
-        // Copy constructor: makes copy of the original IdComponent object.
-        // IdComponent(const IdComponent& original); - removed from 1.8.15
-
         // Gets the identifier of this object.
         virtual hid_t getId () const = 0;