fix(linux): audio: remove duplicate target names

Build complains of duplicate explicit target names. Target names should
be unique. Also, names are not needed for rubrics unless they are
referenced somewhere else. These duplicates are not referenced anywhere.
Remove repeated target names in audio doc.

Signed-off-by: T Pratham <t-pratham@ti.com>

Author: Pratham-T

source/linux/Foundational_Components/Kernel/Kernel_Drivers/Audio.rst

@@ -463,7 +463,6 @@ Board-specific instructions
         p1 - playback jack
 
     .. rubric:: Kernel config
-       :name: kernel-config-8
 
     .. code-block:: text
 
@@ -492,7 +491,6 @@ Board-specific instructions
         }
 
     .. rubric:: User space
-       :name: user-space-8-kernel-audio
 
     ``NOTE: Playback volume is HIGH after boot. Do not use headset without lowering it!!!``
 
@@ -567,7 +565,6 @@ Board-specific instructions
       HDMI bridge**.
 
     .. rubric:: Kernel config
-       :name: kernel-config-9
 
     .. code-block:: text
 
@@ -582,7 +579,6 @@ Board-specific instructions
                 <*>   ASoC Simple sound card support
 
     .. rubric:: User space
-       :name: user-space-9
 
 .. _hdmi_audio:
     The hardware defaults are correct for audio playback, the routing is OK