Auto merge of rust-lang#83577 - geeklint:slice_to_ascii_case_doc_links, r=m-ou-se

Adjust documentation links for slice::make_ascii_*case

The documentation for the functions `slice::to_ascii_lowercase` and `slice::to_ascii_uppercase` contain the suggestion

> To lowercase the value in-place, use `make_ascii_lowercase`

however the link to the suggested method takes you to the page for `u8`, rather than the method of that name on the same page.

Author: bors

library/alloc/src/slice.rs

@@ -642,7 +642,7 @@ impl [u8] {
     ///
     /// To uppercase the value in-place, use [`make_ascii_uppercase`].
     ///
-    /// [`make_ascii_uppercase`]: u8::make_ascii_uppercase
+    /// [`make_ascii_uppercase`]: slice::make_ascii_uppercase
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
     #[inline]
     pub fn to_ascii_uppercase(&self) -> Vec<u8> {
@@ -659,7 +659,7 @@ impl [u8] {
     ///
     /// To lowercase the value in-place, use [`make_ascii_lowercase`].
     ///
-    /// [`make_ascii_lowercase`]: u8::make_ascii_lowercase
+    /// [`make_ascii_lowercase`]: slice::make_ascii_lowercase
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
     #[inline]
     pub fn to_ascii_lowercase(&self) -> Vec<u8> {