Don't use lists in footnotes

Author: philderbeast

doc/cabal-package-description-file.rst

@@ -3455,8 +3455,9 @@ a few options:
 .. rubric:: Footnotes
 
 .. [#old-style-build-tool-depends]
-   Some packages (ab)use :pkg-field:`build-depends` on old-style builds, but this has a few major drawbacks:
-
-   - using Nix-style builds it's considered an error if you depend on a exe-only package via build-depends: the solver will refuse it.
-   - it may or may not place the executable on ``PATH``.
-   - it does not ensure the correct version of the package is installed, so you might end up overwriting versions with each other.
+   Some packages (ab)use :pkg-field:`build-depends` on old-style builds, but
+   this has a few major drawbacks.  Using Nix-style builds it's considered an
+   error if you depend on a exe-only package via build-depends: the solver will
+   refuse it.  It may or may not place the executable on ``PATH``.  It does not
+   ensure the correct version of the package is installed, so you might end up
+   overwriting versions with each other.