Use code style for build-depends

Author: philderbeast

doc/cabal-package-description-file.rst

@@ -3457,8 +3457,8 @@ a few options:
 .. [#old-style-build-tool-depends]
    Some packages (ab)use :pkg-field:`build-depends` on old-style builds, but
    this has a few major drawbacks. First, with Nix-style builds it's considered
-   an error if you depend on a exe-only package via build-depends: the solver
-   will refuse it.  Next, build-depends may or may not place the executable on
-   ``PATH``.  Finally, build-depends does not ensure the correct version of the
-   package is installed, so you might end up overwriting versions with each
-   other.
+   an error if you depend on a exe-only package via ``build-depends``: the
+   solver will refuse it.  Next, ``build-depends`` may or may not place the
+   executable on ``PATH``.  Finally, ``build-depends`` does not ensure the
+   correct version of the package is installed, so you might end up overwriting
+   versions with each other.