Fix `prefer-oldest` documentation

Available since 3.10, not 3.8.

Fix `prefer-oldest` documentation
7b40528f · f-a · Mikolaj · 00483269 · 7b40528f
Commit 7b40528f authored 2 years ago by f-a Committed by Mikolaj 1 year ago
--- a/doc/cabal-project.rst
+++ b/doc/cabal-project.rst
@@ -1769,7 +1769,7 @@ Most users generally won't need these.
               --prefer-oldest
               --no-prefer-oldest
    :synopsis: Prefer the oldest versions of packages available.
-    :since:    3.8
+    :since:    3.10

    :default:  False