Fix typo (#202)

Closes astral-sh/uv#4625

scenarios/fork/marker-inherit.toml

@@ -5,7 +5,7 @@ are used to ignore dependencies which cannot possibly be installed by a
 resolution produced by that fork.
 
 In this example, the `a<2` dependency is only active on Darwin
-platforms. But the `a==1.0.0` distribution has a dependency on on `b`
+platforms. But the `a==1.0.0` distribution has a dependency on `b`
 that is only active on Linux, where as `a==2.0.0` does not. Therefore,
 when the fork provoked by the `a<2` dependency considers `b`, it should
 ignore it because it isn't possible for `sys_platform == 'linux'` and