input: Documentation: corrections for event-codes.rst

Fix hyphenation, typos, capitalization, and a referenced file name
(.txt -> .rst).

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-3-rdunlap@infradead.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/input/event-codes.rst

@@ -246,9 +246,9 @@ A few EV_ABS codes have special meanings:
 
      A device should set the resolution of the axis to indicate whether the
      pressure is in measurable units. If the resolution is zero, the
-     pressure data is in arbitrary units. If the resolution is nonzero, the
+     pressure data is in arbitrary units. If the resolution is non-zero, the
      pressure data is in units/gram. For example, a value of 10 with a
-     resolution of 1 represents 10 gram, a value of 10 with a resolution on
+     resolution of 1 represents 10 gram, a value of 10 with a resolution of
      1000 represents 10 microgram.
 
 EV_SW
@@ -344,7 +344,7 @@ INPUT_PROP_BUTTONPAD
 
 For touchpads where the button is placed beneath the surface, such that
 pressing down on the pad causes a button click, this property should be
-set. Common in clickpad notebooks and macbooks from 2009 and onwards.
+set. Common in Clickpad notebooks and Macbooks from 2009 and onwards.
 
 Originally, the buttonpad property was coded into the bcm5974 driver
 version field under the name integrated button. For backwards
@@ -356,7 +356,7 @@ INPUT_PROP_SEMI_MT
 Some touchpads, most common between 2008 and 2011, can detect the presence
 of multiple contacts without resolving the individual positions; only the
 number of contacts and a rectangular shape is known. For such
-touchpads, the semi-mt property should be set.
+touchpads, the SEMI_MT property should be set.
 
 Depending on the device, the rectangle may enclose all touches, like a
 bounding box, or just some of them, for instance the two most recent
@@ -394,7 +394,7 @@ Guidelines
 ==========
 
 The guidelines below ensure proper single-touch and multi-finger functionality.
-For multi-touch functionality, see the multi-touch-protocol.txt document for
+For multi-touch functionality, see the multi-touch-protocol.rst document for
 more information.
 
 Mice