extra: fix spelling in docs.

src/libextra/arc.rs

@@ -276,7 +276,7 @@ impl<T:Freeze + Send> MutexArc<T> {
      * might contain nested MutexArcs inside.
      *
      * The purpose of this is to offer a safe implementation of MutexArc to be
-     * used instead of RWArc in cases where no readers are needed and sightly
+     * used instead of RWArc in cases where no readers are needed and slightly
      * better performance is required.
      *
      * Both methods have the same failure behaviour as unsafe_access and

src/libextra/getopts.rs

@@ -30,7 +30,7 @@
 //! file name following `-o`, and accepts both `-h` and `--help` as optional flags.
 //!
 //! ~~~{.rust}
-//! exter mod extra;
+//! extern mod extra;
 //! use extra::getopts::*;
 //! use std::os;
 //!
@@ -114,7 +114,7 @@ pub enum Occur {
 pub struct Opt {
     /// Name of the option
     name: Name,
-    /// Wheter it has an argument
+    /// Whether it has an argument
     hasarg: HasArg,
     /// How often it can occur
     occur: Occur,
@@ -154,7 +154,7 @@ pub enum Fail_ {
     UnexpectedArgument(~str),
 }
 
-/// The type of failure that occured.
+/// The type of failure that occurred.
 #[deriving(Eq)]
 #[allow(missing_doc)]
 pub enum FailType {

src/libextra/tempfile.rs

@@ -18,7 +18,7 @@ use std::io;
 use std::io::fs;
 
 /// A wrapper for a path to temporary directory implementing automatic
-/// scope-pased deletion.
+/// scope-based deletion.
 pub struct TempDir {
     priv path: Option<Path>
 }

src/libextra/uuid.rs

@@ -17,7 +17,7 @@ identifiers to entities without requiring a central allocating authority.
 
 They are particularly useful in distributed systems, though can be used in
 disparate areas, such as databases and network protocols.  Typically a UUID is
-displayed in a readable string form as a sequence of hexadecimals digits,
+displayed in a readable string form as a sequence of hexadecimal digits,
 separated into groups by hyphens.
 
 The uniqueness property is not strictly guaranteed, however for all practical
@@ -89,11 +89,11 @@ pub enum UuidVersion {
 /// The reserved variants of UUIDs
 #[deriving(Eq)]
 pub enum UuidVariant {
-    /// Reserved by the NCS for backward compatability
+    /// Reserved by the NCS for backward compatibility
     VariantNCS,
     /// As described in the RFC4122 Specification (default)
     VariantRFC4122,
-    /// Resreved by Microsoft for backward compatability
+    /// Reserved by Microsoft for backward compatibility
     VariantMicrosoft,
     /// Reserved for future expansion
     VariantFuture,
@@ -313,7 +313,7 @@ impl Uuid {
         str::from_utf8_owned(s)
     }
 
-    /// Returns a string of hexadecimal digits, separated into groups with a hypen
+    /// Returns a string of hexadecimal digits, separated into groups with a hyphen.
     ///
     /// Example: `550e8400-e29b-41d4-a716-446655440000`
     pub fn to_hyphenated_str(&self) -> ~str {