Fix spelling (#475)

Fixed the spelling in a few comments.

src/cursor.rs

@@ -10,7 +10,7 @@
 //! ## Examples
 //!
 //! Cursor actions can be performed with commands.
-//! Please have a look at [command documention](../index.html#command-api) for a more detailed documentation.
+//! Please have a look at [command documentation](../index.html#command-api) for a more detailed documentation.
 //!
 //! ```no_run
 //! use std::io::{stdout, Write};

src/style/macros.rs

@@ -34,7 +34,7 @@
 // Produces a single method for a "base" Styler implementation
 //
 // The first argument is the type for which Styler is being implemented. Because this is the same
-// for all "base" types, we can collase them into a single macro.
+// for all "base" types, we can collapse them into a single macro.
 macro_rules! def_attr_base {
     ($impl_ty:ty, $name:ident => $attr:path) => {
         fn $name(self) -> StyledContent<$impl_ty> {

src/style/styled_content.rs

@@ -83,7 +83,7 @@ impl<D: Display> StyledContent<D> {
         &self.style
     }
 
-    /// Returns a mutable reference to the style, so that it can be futher
+    /// Returns a mutable reference to the style, so that it can be further
     /// manipulated
     #[inline]
     pub fn style_mut(&mut self) -> &mut ContentStyle {
@@ -111,7 +111,7 @@ impl<D: Display> Display for StyledContent<D> {
 
         self.content.fmt(f)?;
 
-        // TODO: There are specific command sequences for "reset forground
+        // TODO: There are specific command sequences for "reset foreground
         // color (39m)" and "reset background color (49m)"; consider using
         // these.
         if reset {

src/terminal.rs

@@ -8,7 +8,7 @@
 //! to demonstrate the capabilities.
 //!
 //! Most terminal actions can be performed with commands.
-//! Please have a look at [command documention](../index.html#command-api) for a more detailed documentation.
+//! Please have a look at [command documentation](../index.html#command-api) for a more detailed documentation.
 //!
 //! ## Screen Buffer
 //!