Auto merge of #34153 - apasel422:btree, r=alexcrichton

Update tracking issue for `{BTreeMap, BTreeSet}::{append, split_off}`

r? @alexcrichton

src/libcollections/btree/map.rs

@@ -584,7 +584,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// assert_eq!(a[&5], "f");
     /// ```
     #[unstable(feature = "btree_append", reason = "recently added as part of collections reform 2",
-               issue = "19986")]
+               issue = "34152")]
     pub fn append(&mut self, other: &mut Self) {
         // Do we have to append anything at all?
         if other.len() == 0 {
@@ -938,7 +938,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     /// ```
     #[unstable(feature = "btree_split_off",
                reason = "recently added as part of collections reform 2",
-               issue = "19986")]
+               issue = "34152")]
     pub fn split_off<Q: ?Sized + Ord>(&mut self, key: &Q) -> Self
         where K: Borrow<Q>
     {

src/libcollections/btree/set.rs

@@ -576,7 +576,7 @@ impl<T: Ord> BTreeSet<T> {
     /// assert!(a.contains(&5));
     /// ```
     #[unstable(feature = "btree_append", reason = "recently added as part of collections reform 2",
-               issue = "19986")]
+               issue = "34152")]
     pub fn append(&mut self, other: &mut Self) {
         self.map.append(&mut other.map);
     }
@@ -613,7 +613,7 @@ impl<T: Ord> BTreeSet<T> {
     /// ```
     #[unstable(feature = "btree_split_off",
                reason = "recently added as part of collections reform 2",
-               issue = "19986")]
+               issue = "34152")]
     pub fn split_off<Q: ?Sized + Ord>(&mut self, key: &Q) -> Self where T: Borrow<Q> {
         BTreeSet { map: self.map.split_off(key) }
     }