Fix spelling errors and capitalization.

4 files changed, 4 insertions, 4 deletions

diff --git a/src/libcollections/lib.rs b/src/libcollections/lib.rs
index 175597c77f6..834c9549733 100644
--- a/src/libcollections/lib.rs
+++ b/src/libcollections/lib.rs
@@ -289,7 +289,7 @@ pub trait Set<T>: Collection {
 }
 
 /// A mutable collection of values which are distinct from one another that
-/// can be mutaed.
+/// can be mutated.
 pub trait MutableSet<T>: Set<T> + Mutable {
     /// Adds a value to the set. Returns `true` if the value was not already
     /// present in the set.
diff --git a/src/libcollections/ringbuf.rs b/src/libcollections/ringbuf.rs
index c71367265db..3665535e720 100644
--- a/src/libcollections/ringbuf.rs
+++ b/src/libcollections/ringbuf.rs
@@ -132,7 +132,7 @@ impl<T> RingBuf<T> {
               elts: Vec::from_fn(cmp::max(MINIMUM_CAPACITY, n), |_| None)}
     }
 
-    /// Retrieva an element in the `RingBuf` by index.
+    /// Retrieve an element in the `RingBuf` by index.
     ///
     /// Fails if there is no element with the given index.
     ///
diff --git a/src/libcollections/smallintmap.rs b/src/libcollections/smallintmap.rs
index b3b3bb1ea22..dd3a639aeac 100644
--- a/src/libcollections/smallintmap.rs
+++ b/src/libcollections/smallintmap.rs
@@ -324,7 +324,7 @@ impl<V:Clone> SmallIntMap<V> {
     /// Updates a value in the map. If the key already exists in the map,
     /// modifies the value with `ff` taking `oldval, newval`.
     /// Otherwise, sets the value to `newval`.
-    /// Returasn `true` if the key did not already exist in the map.
+    /// Returns `true` if the key did not already exist in the map.
     ///
     /// # Example
     ///
diff --git a/src/libcollections/str.rs b/src/libcollections/str.rs
index c13695e2b84..88c683ef44e 100644
--- a/src/libcollections/str.rs
+++ b/src/libcollections/str.rs
@@ -44,7 +44,7 @@
 //!
 //! # Representation
 //!
-//! Rust's string type, `str`, is a sequence of unicode scalar values encoded as a
+//! Rust's string type, `str`, is a sequence of Unicode scalar values encoded as a
 //! stream of UTF-8 bytes. All strings are guaranteed to be validly encoded UTF-8
 //! sequences. Additionally, strings are not null-terminated and can contain null
 //! bytes.