Typos and whitespace fixes.

common/content/events.js

@@ -701,7 +701,7 @@ const Events = Module("events", {
     // access to the real focus target
     // Huh? --djk
     onFocusChange: function onFocusChange(event) {
-        // command line has it's own focus change handler
+        // command line has its own focus change handler
         if (dactyl.mode == modes.COMMAND_LINE)
             return;
 

common/modules/base.jsm

@@ -833,7 +833,7 @@ function XPCOM(interfaces, superClass) {
 }
 
 /**
- * Constructs a mew Module class and instantiates an instance into the current
+ * Constructs a new Module class and instantiates an instance into the current
  * module global object.
  *
  * @param {string} name The name of the instance.