sphinx-lint: superfluous backtick in front of role

Fix all instances of backtick-before-role as reported by 'make sphinx-lint'.

(From yocto-docs rev: d38f9b25c0bd095fe1158f14226fb74f8645496a)

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/sbom.rst

@@ -25,14 +25,14 @@ users can read in standardized format.
 assessments, as all the components used in the Software Supply Chain are listed.
 
 The OpenEmbedded build system doesn't generate such information by default,
-though the `:term:`Poky` reference distribution has it enabled out of the box.
+though the :term:`Poky` reference distribution has it enabled out of the box.
 
 To enable it, inherit the :ref:`ref-classes-create-spdx` class from a
 configuration file::
 
    INHERIT += "create-spdx"
 
-In the `:term:`Poky` reference distribution, :term:`SPDX` generation does
+In the :term:`Poky` reference distribution, :term:`SPDX` generation does
 consume some build time resources and thus if needed it can be disabled from a
 :term:`configuration file`::