Fix a few nits in comments in input_stream.dart

runtime/bin/input_stream.dart

Index: runtime/bin/input_stream.dart
===================================================================
--- runtime/bin/input_stream.dart	(revision 3128)
+++ runtime/bin/input_stream.dart	(working copy)
@@ -120,9 +120,8 @@
 
   /**
    * Reads the next line from the stream. The line ending characters
-   * will not be part og the returned string. If a full line is not
-   * available null will be returned. The line break character(s) are
-   * discarded.
+   * will not be part of the returned string. If a full line is not
+   * available null will be returned.
    */
   String readLine();
 
@@ -139,14 +138,14 @@
 
   /**
    * Sets the handler that gets called when data is available. The two
-   * handlers [dataHandler} and [lineHandler] are mutually exclusive
+   * handlers [dataHandler] and [lineHandler] are mutually exclusive
    * and setting one will remove the other.
    */
   void set dataHandler(void callback());
 
   /**
    * Sets the handler that gets called when a line is available. The
-   * two handlers [dataHandler} and [lineHandler] are mutually
+   * two handlers [dataHandler] and [lineHandler] are mutually
    * exclusive and setting one will remove the other.
    */
   void set lineHandler(void callback());