chore: remove stale processors.wiki doc reference

source/linux/Release_Specific/_Layer_Configuration.rst points to
https://processors.wiki.ti.com/index.php/Processor_SDK_Building_The_SDK#Layer_Configuration

This page no longer exists, hence removing this reference

Signed-off-by: Praneeth Bajjuri <[email protected]>

Author: praneethbajjuri

source/linux/Release_Specific/_Layer_Configuration.rst

@@ -2,8 +2,6 @@
 Yocto Layer Configuration
 **************************
 
-.. http://processors.wiki.ti.com/index.php/Processor_SDK_Building_The_SDK#Layer_Configuration
-
 Processor SDK uses the following oe-layersetup configs to configure the
 meta layers. These are the <config> used in the command: