Fix a typo in the dependent parameters example.

Author: atrick

proposals/NNNN-lifetime-dependency.md

@@ -307,7 +307,7 @@ We expect these implicit inferences to cover most cases, with the explicit form
 Normally, lifetime dependence is required when a nonescapable function result depends on an argument to that function. In some rare cases, however, a nonescapable function parameter may depend on another argument to that function. Consider a function with an `inout` parameter. The function body may reassign that parameter to a value that depends on another parameter. This is similar in principle to a result dependence.
 
 ```swift
-func mayReassign(span: dependsOn(a) inout [Int], to a: [Int]) {
+func mayReassign(span: dependsOn(a) inout Span<Int>, to a: [Int]) {
   span = a.span()
 }
 ```