Fix copy-pasted module docstrings

This updates the module docstrings for 5 modules that duplicate the
docstring from the `proc` module. This was presumably the result of using
the `proc` module as a template for the others.

volatility3/framework/plugins/linux/check_syscall.py

@@ -1,8 +1,7 @@
 # This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
 # which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
 #
-"""A module containing a collection of plugins that produce data typically
-found in Linux's /proc file system."""
+"""A module containing a plugin that checks the system call table for hooks."""
 import contextlib
 import logging
 from typing import List