fix(dsp): remove invalid line-block

Remove an invalid line block that was breaking parsing.

Signed-off-by: Randolph Sapp <[email protected]>

Author: StaticRocket

source/linux/Foundational_Components/IPC/_Multiple_Ways_of_ARM-DSP_Communication.rst

@@ -225,7 +225,6 @@ and DSP processors in a multi-processor environment.
   <http://software-dl.ti.com/processor-sdk-rtos/esd/docs/latest/
   rtos/index_Foundational_Components.html#ipc>`__
 
-|
 .. rubric:: User Cases
    :name: user-cases