git-ref-format: fix typo in documentation

Fixes small typo in documentation of `and` function.

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

git-ref-format/core/src/name.rs

@@ -309,7 +309,7 @@ impl RefString {
     ///
     /// This is a consuming version of [`RefString::push`] which can be chained.
     /// Prefer this over chaining calls to [`RefStr::join`] if the
-    /// intermediate values are not neede.
+    /// intermediate values are not needed.
     pub fn and<R>(self, other: R) -> Self
     where
         R: AsRef<RefStr>,