scsi: target: docs: Remove tcm_mod_builder.py

This script is not used and requires additional development to sync with
the SCSI target code.
Signed-off-by: Rong Tao <rongtao@cestc.cn>
Link: https://lore.kernel.org/r/tencent_58D7935159C421036421B42CD04B0A959207@qq.comReviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/target/scripts.rst

-TCM mod builder script
-----------------------
-
-.. literalinclude:: tcm_mod_builder.py
-    :language: perl
-
 Target export device script
 ---------------------------