manuals: fix incorrect double backticks

As reported by "make sphinx-lint"

(From yocto-docs rev: 18d86626406fe07d4f62ef0b9168c0220b3dd90a)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

documentation/profile-manual/usage.rst

@@ -1853,7 +1853,7 @@ Practically speaking, that means you need to do the following:
 
 -  Or build a non-SDK image but include the profiling tools
    (edit ``local.conf`` and add ``tools-profile`` to the end of
-   :term:``EXTRA_IMAGE_FEATURES`` variable)::
+   :term:`EXTRA_IMAGE_FEATURES` variable)::
 
       $ bitbake core-image-sato