Fix src link URLs for file rename

Author: notriddle

tests/rustdoc/src-links-implementor-43893.rs

@@ -7,15 +7,15 @@
 pub trait SomeTrait {}
 pub struct SomeStruct;
 
-// @has foo/trait.SomeTrait.html '//a/@href' '../src/foo/issue-43893.rs.html#9'
+// @has foo/trait.SomeTrait.html '//a/@href' '../src/foo/src-links-implementor-43893.rs.html#11'
 impl SomeTrait for usize {}
 
-// @has foo/trait.SomeTrait.html '//a/@href' '../src/foo/issue-43893.rs.html#12-14'
+// @has foo/trait.SomeTrait.html '//a/@href' '../src/foo/src-links-implementor-43893.rs.html#14-16'
 impl SomeTrait for SomeStruct {
     // deliberately multi-line impl
 }
 
 pub trait AnotherTrait {}
 
-// @has foo/trait.AnotherTrait.html '//a/@href' '../src/foo/issue-43893.rs.html#19'
+// @has foo/trait.AnotherTrait.html '//a/@href' '../src/foo/src-links-implementor-43893.rs.html#21'
 impl<T> AnotherTrait for T {}