Improve Huion Inspiroy 2 m support (#699)

data/huion-inspiroy-2-m---h951p.tablet

@@ -1,29 +1,61 @@
 # This tablet description file has been generated using an automated tool:
-# https://github.com/JoseExposito/uclogic-libwacom-tablet-descriptions
-# If you own this tablet, please improve it.
+# Huion
+# Inspiroy 2 M
+# H951P
+#
+# sysinfo.nLrNAqLFy1.tar.gz
+# https://github.com/linuxwacom/wacom-hid-descriptors/issues/383
+#
+#
+# Button Map:
+# (A=1, B=2, C=3, ...)
+#
+#     *-----------------------*
+#     |                       |
+# A D |                       |
+# B E |                       |
+# C F |                       |
+#   G |                       |
+#     |        TABLET         |
+#   H |                       |
+#   I |                       |
+#   J |                       |
+#   K |                       |
+#     |                       |
+#     *-----------------------*
+#
+#
+# Dial Map:
+# (A=1, B=2, C=3, ...)
+#
+#     *-----------------------*
+#     |                       |
+#     |                       |
+#   A |        TABLET         |
+#     |                       |
+#     |                       |
+#     *-----------------------*
 #
-# sysinfo missing - if you own this device please provide it. See this link
-# for details: https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device
 
 [Device]
-Name=Inspiroy 2 M - H951P
-ModelName=Inspiroy 2 M - H951P
+Name=Huion Inspiroy 2 M
+ModelName=H951P
 Class=Bamboo
-DeviceMatch=usb|256c|0067||HUION_T21k
-Width=9  # autogenerated value, please fix
-Height=6  # autogenerated value, please fix
+DeviceMatch=usb|256c|0067;
+Width=9
+Height=6  # Technically rounds down to 5, but 6 seems more natural
+IntegratedIn=
 Layout=huion-inspiroy-2-m---h951p.svg
 Styli=@generic-no-eraser;
-IntegratedIn=
 
 [Features]
-NumStrips=0
-NumRings=0
-NumDials=1
-Reversible=true
 Stylus=true
+Reversible=true
 Touch=false
 TouchSwitch=false
+NumRings=0
+NumDials=1
+NumStrips=0
 
 [Buttons]
 Left=A;B;C;D;E;F;G;H;I;J;K