doc: sphinx-lint: fix bad usage of "default role"

Fixes bad usage of single backticks in lieu of double backticks for
rendering inline literals, or simple '*' for italics.

When appropriate, a better construct than double backticks has been
selected (ex. :file:, :kconfig:option:, :c:func:, ...), or proper :ref:
have been used if the original intention was to have a link.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

doc/develop/west/sign.rst

@@ -116,7 +116,7 @@ for all images, for example:
    west build -b <board> <application> -DSIGNING_SCRIPT=<file>
 
 The zephyr property method is achieved by adjusting the ``SIGNING_SCRIPT`` property
-on the `zephyr_property_target`, ideally from by a module by using:
+on the ``zephyr_property_target``, ideally from by a module by using:
 
 .. code-block:: cmake