sim-se: remove comment for code that moved

The page table code must have moved from this class, because
the comment no longer accurately reflects upon any of the
surrounding code.

Change-Id: If08a4298c1237a541d9875ddeaf3d3ecfd98e9db
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/12300
Maintainer: Brandon Potter <Brandon.Potter@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

src/arch/x86/process.hh

@@ -60,13 +60,6 @@ namespace X86ISA
     class X86Process : public Process
     {
       protected:
-        /**
-         * Declaration of architectural page table for x86.
-         *
-         * These page tables are stored in system memory and respect x86
-         * specification.
-         */
-
         Addr _gdtStart;
         Addr _gdtSize;