Add bstr files to linkchecker since they have a Deref to slice

The Deref brings in the documentation from slice, so it has the same
issue as slice.

Author: joshtriplett

src/tools/linkchecker/main.rs

@@ -50,6 +50,12 @@ const LINKCHECK_EXCEPTIONS: &[(&str, &[&str])] = &[
     ("alloc/slice/trait.Concat.html", &["#method.concat"]),
     ("alloc/slice/index.html", &["#method.concat", "#method.join"]),
     ("alloc/vec/struct.Vec.html", &["#method.sort_by_key", "#method.sort_by_cached_key"]),
+    ("alloc/bstr/struct.ByteString.html", &["#method.to_ascii_uppercase", "#method.to_ascii_lowercase",
+                                            "core/slice::sort_by_key", "core\\slice::sort_by_key",
+                                            "#method.sort_by_cached_key"]),
+    ("core/bstr/struct.ByteStr.html", &["#method.to_ascii_uppercase", "#method.to_ascii_lowercase",
+                                        "core/slice::sort_by_key", "core\\slice::sort_by_key",
+                                        "#method.sort_by_cached_key"]),
     ("core/primitive.str.html", &["#method.to_ascii_uppercase", "#method.to_ascii_lowercase"]),
     ("core/primitive.slice.html", &["#method.to_ascii_uppercase", "#method.to_ascii_lowercase",
                                     "core/slice::sort_by_key", "core\\slice::sort_by_key",