Add missing #[allow(missing_docs)] on hack functions in alloc

Author: Urgau

library/alloc/src/slice.rs

@@ -96,6 +96,7 @@ pub(crate) mod hack {
 // We shouldn't add inline attribute to this since this is used in
 // `vec!` macro mostly and causes perf regression. See #71204 for
 // discussion and perf results.
+#[allow(missing_docs)]
 pubfninto_vec<T,A:Allocator>(b:Box<[T],A>) -> Vec<T,A>{
 unsafe{
 let len = b.len();
@@ -105,6 +106,7 @@ pub(crate) mod hack {
 }
 
 #[cfg(not(no_global_oom_handling))]
+#[allow(missing_docs)]
 #[inline]
 pubfnto_vec<T:ConvertVec,A:Allocator>(s:&[T],alloc:A) -> Vec<T,A>{
 T::to_vec(s, alloc)

library/alloc/src/string.rs

@@ -508,6 +508,7 @@ impl String {
 // NB see the slice::hack module in slice.rs for more information
 #[inline]
 #[cfg(test)]
+#[allow(missing_docs)]
 pubfnfrom_str(_:&str) -> String{
 panic!("not available with cfg(test)");
 }

library/std/src/io/buffered/bufreader.rs

@@ -267,6 +267,7 @@ impl<R: ?Sized> BufReader<R> {
 // This is only used by a test which asserts that the initialization-tracking is correct.
 #[cfg(test)]
 impl<R: ?Sized>BufReader<R>{
+#[allow(missing_docs)]
 pubfninitialized(&self) -> usize{
 self.buf.initialized()
 }