doc/configuration: fix spelling of MatchedSysfsGPIO class name

The exact class name must be used in the configuration snippet. Stick to
that name also in the headline as well as in the text.

While at it, link MatchedSysfsGPIO and SysfsGPIO.

Fixes: 63873ee ("resource: matchedsysfsgpio: add udev matched gpios")
Signed-off-by: Bastian Krause <bst@pengutronix.de>

Author: Bastian-Krause

doc/configuration.rst

@@ -542,16 +542,16 @@ Arguments:
 Used by:
   - `GpioDigitalOutputDriver`_
 
-MatchedSysfsGpio
+MatchedSysfsGPIO
 ++++++++++++++++
-A MatchedSysfsGpio resource describes a GPIO line, like a SysfsGPIO.
+A :any:`MatchedSysfsGPIO` describes a GPIO line, like a `SysfsGPIO`_.
 The gpiochip is identified by matching udev properties. This allows
 identification through hot-plugging or rebooting for controllers like
 USB based gpiochips.
 
 .. code-block:: yaml
 
-   MatchedSysfsGpio:
+   MatchedSysfsGPIO:
      match:
        '@SUBSYSTEM': 'usb'
        '@ID_SERIAL_SHORT': 'D38EJ8LF'