Use double quotes for module level docstrings

Make module level docstrings distinguishable from license text.

Related #2273

lib/hidapi/udev.py

@@ -13,6 +13,7 @@
 ## You should have received a copy of the GNU General Public License along
 ## with this program; if not, write to the Free Software Foundation, Inc.,
 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
 """Generic Human Interface Device API.
 
 It is currently a partial pure-Python implementation of the native HID API

lib/logitech_receiver/descriptors.py

@@ -14,13 +14,15 @@
 ## with this program; if not, write to the Free Software Foundation, Inc.,
 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 
-#
-# Devices (not receivers) known to Solaar.
-# Solaar can handle many recent devices without having any entry here.
-# An entry should only be added to fix problems, such as
-# - the device's device ID or WPID falls outside the range that Solaar searches
-# - the device uses a USB interface other than 2
-# - the name or codename should be different from what the device reports
+
+"""Devices (not receivers) known to Solaar.
+
+Solaar can handle many recent devices without having any entry here.
+An entry should only be added to fix problems, such as
+- the device's device ID or WPID falls outside the range that Solaar searches
+- the device uses a USB interface other than 2
+- the name or codename should be different from what the device reports
+"""
 
 from .hidpp10_constants import DEVICE_KIND
 from .hidpp10_constants import REGISTERS as REG

lib/logitech_receiver/exceptions.py

@@ -17,9 +17,7 @@
 
 from .common import KwException
 
-#
-# Exceptions that may be raised by this API.
-#
+"""Exceptions that may be raised by this API."""
 
 
 class NoReceiver(KwException):

lib/logitech_receiver/hidpp10_constants.py

@@ -17,10 +17,11 @@
 
 from .common import NamedInts
 
-#
-# Constants - most of them as defined by the official Logitech HID++ 1.0
-# documentation, some of them guessed.
-#
+"""HID constants for HID++ 1.0.
+
+Most of them as defined by the official Logitech HID++ 1.0
+documentation, some of them guessed.
+"""
 
 DEVICE_KIND = NamedInts(
     unknown=0x00,