doc: don't use deprecated "---help---" markers in target docs

I'm not convinced the script makes useful automaed help lines anyway,
but since we're trying to deprecate the use of "---help---" in Kconfig
files, let's fix the doc example code too.

See commit a7f7f624 ("treewide: replace '---help---' in Kconfig
files with 'help'")

Cc: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/target/tcm_mod_builder.py

@@ -568,7 +568,7 @@ def tcm_mod_build_kconfig(fabric_mod_dir_var, fabric_mod_name):
 	buf += "	tristate \"" + fabric_mod_name.upper() + " fabric module\"\n"
 	buf += "	depends on TARGET_CORE && CONFIGFS_FS\n"
 	buf += "	default n\n"
-	buf += "	---help---\n"
+	buf += "	help\n"
 	buf += "	  Say Y here to enable the " + fabric_mod_name.upper() + " fabric module\n"
 
 	ret = p.write(buf)