docs: kbuild: remove description of KBUILD_LDS_MODULE

Commit 596b0474 ("kbuild: preprocess module linker script")
removes KBUILD_LDS_MODULE, yet the variable is still mentioned in
kbuild documentation. Remove the reference to the now-nonexistent
variable.

Signed-off-by: Sangmoon Kim <sangmoon.kim@samsung.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Documentation/kbuild/makefiles.rst

@@ -1215,10 +1215,6 @@ KBUILD_LDFLAGS_MODULE
 KBUILD_LDS
   The linker script with full path. Assigned by the top-level Makefile.
 
-KBUILD_LDS_MODULE
-  The module linker script with full path. Assigned by the top-level
-  Makefile and additionally by the arch Makefile.
-
 KBUILD_VMLINUX_OBJS
   All object files for vmlinux. They are linked to vmlinux in the same
   order as listed in KBUILD_VMLINUX_OBJS.