Remove more .cabal file mentions

README.md

@@ -20,17 +20,14 @@ existing Hackage package(s).
 
 ## How this works
 
-This repo contains `<pkg-id>.patch` and `<pkg-id>.cabal` files in the
+This repo contains `<pkg-id>.patch`` files in the
 [`patches/`](./patches/) folder (where `<pkg-id>` refers to a specific
 release of a package, e.g. `lens-4.15.3`).
 
 Once merged to `master`, all package releases whose `<pkg-id>` is
 mentioned will enter the *HEAD.hackage* package index; if there is a
 `.patch` file, the respective releases tarballs are patched
-(i.e. mutated!). If there is a `.cabal` file, it is included as a
-revision in the package index. Consequently, if there is only a
-`.cabal` file and no `.patch` file, the original source `.tar.gz` is
-included in verbatim (i.e. *not* mutated).
+(i.e. mutated!).
 
 If this operation succeeds, the `HEAD.hackage` package index at
 http://HEAD.hackage.haskell.org/ is updated to contain the new index