Minor documentation fixes in displayio

Author: lesamouraipourpre

shared-bindings/displayio/FourWire.c

@@ -48,7 +48,7 @@
 //|         The SPI bus and pins are then in use by the display until `displayio.release_displays()` is
 //|         called even after a reload. (It does this so CircuitPython can use the display after your code
 //|         is done.) So, the first time you initialize a display bus in code.py you should call
-//|         :py:func`displayio.release_displays` first, otherwise it will error after the first code.py run.
+//|         :py:func:`displayio.release_displays` first, otherwise it will error after the first code.py run.
 //|
 //|         :param busio.SPI spi_bus: The SPI bus that make up the clock and data lines
 //|         :param microcontroller.Pin command: Data or command pin

shared-bindings/displayio/I2CDisplay.c

@@ -48,7 +48,7 @@
 //|         The I2C bus and pins are then in use by the display until `displayio.release_displays()` is
 //|         called even after a reload. (It does this so CircuitPython can use the display after your code
 //|         is done.) So, the first time you initialize a display bus in code.py you should call
-//|         :py:func`displayio.release_displays` first, otherwise it will error after the first code.py run.
+//|         :py:func:`displayio.release_displays` first, otherwise it will error after the first code.py run.
 //|
 //|         :param busio.I2C i2c_bus: The I2C bus that make up the clock and data lines
 //|         :param int device_address: The I2C address of the device

shared-bindings/displayio/ParallelBus.c

@@ -49,7 +49,7 @@
 //|         The parallel bus and pins are then in use by the display until `displayio.release_displays()`
 //|         is called even after a reload. (It does this so CircuitPython can use the display after your
 //|         code is done.) So, the first time you initialize a display bus in code.py you should call
-//|         :py:func`displayio.release_displays` first, otherwise it will error after the first code.py run.
+//|         :py:func:`displayio.release_displays` first, otherwise it will error after the first code.py run.
 //|
 //|         :param microcontroller.Pin data0: The first data pin. The rest are implied
 //|         :param microcontroller.Pin command: Data or command pin