Documentation/l1tf: Remove Yonah processors from not vulnerable list

Dave reported, that it's not confirmed that Yonah processors are
unaffected. Remove them from the list.
Reported-by: Nave Hansen <dave.hansen@intel.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Documentation/admin-guide/l1tf.rst

@@ -19,8 +19,6 @@ vulnerability is not present on:
    - A range of Intel ATOM processors (Cedarview, Cloverview, Lincroft,
      Penwell, Pineview, Silvermont, Airmont, Merrifield)
 
-   - The Intel Core Duo Yonah variants (2006 - 2008)
-
    - The Intel XEON PHI family
 
    - Intel processors which have the ARCH_CAP_RDCL_NO bit set in the