fix doc aliases for 1.48

Author: spacejam

src/db.rs

@@ -12,7 +12,7 @@ const DEFAULT_TREE_ID: &[u8] = b"__sled__default";
 /// to disk, using the same method used by
 /// `Tree::flush`.
 #[derive(Clone)]
-#[doc(alias("database"))]
+#[doc(alias = "database")]
 pub struct Db {
     #[doc(hidden)]
     pub context: Context,

src/tree.rs

@@ -153,7 +153,7 @@ impl Tree {
     /// assert_eq!(db.insert(&[1, 2, 3], vec![1]), Ok(Some(sled::IVec::from(&[0]))));
     /// # Ok(()) }
     /// ```
-    #[doc(alias("set"))]
+    #[doc(alias = "set")]
     pub fn insert<K, V>(&self, key: K, value: V) -> Result<Option<IVec>>
     where
         K: AsRef<[u8]>,