fix various typos in doc comments

src/libstd/sys/redox/fd.rs

@@ -26,7 +26,7 @@ impl FileDesc {
 
     pub fn raw(&self) -> usize { self.fd }
 
-    /// Extracts the actual filedescriptor without closing it.
+    /// Extracts the actual file descriptor without closing it.
     pub fn into_raw(self) -> usize {
         let fd = self.fd;
         mem::forget(self);

src/libstd/sys/redox/syscall/call.rs

@@ -45,7 +45,7 @@ pub unsafe fn brk(addr: usize) -> Result<usize> {
 /// # Errors
 ///
 /// * `EACCES` - permission is denied for one of the components of `path`, or `path`
-/// * `EFAULT` - `path` does not point to the process's addressible memory
+/// * `EFAULT` - `path` does not point to the process's addressable memory
 /// * `EIO` - an I/O error occurred
 /// * `ENOENT` - `path` does not exit
 /// * `ENOTDIR` - `path` is not a directory
@@ -347,7 +347,7 @@ pub fn waitpid(pid: usize, status: &mut usize, options: usize) -> Result<usize>
 ///
 /// * `EAGAIN` - the file descriptor was opened with `O_NONBLOCK` and writing would block
 /// * `EBADF` - the file descriptor is not valid or is not open for writing
-/// * `EFAULT` - `buf` does not point to the process's addressible memory
+/// * `EFAULT` - `buf` does not point to the process's addressable memory
 /// * `EIO` - an I/O error occurred
 /// * `ENOSPC` - the device containing the file descriptor has no room for data
 /// * `EPIPE` - the file descriptor refers to a pipe or socket whose reading end is closed

src/libstd/sys/unix/fd.rs

@@ -46,7 +46,7 @@ impl FileDesc {
 
     pub fn raw(&self) -> c_int { self.fd }
 
-    /// Extracts the actual filedescriptor without closing it.
+    /// Extracts the actual file descriptor without closing it.
     pub fn into_raw(self) -> c_int {
         let fd = self.fd;
         mem::forget(self);