fixed code comment grammar

src/cocoa_init.m

@@ -390,9 +390,9 @@ void _glfwCreateAutoreleasePool()
     }
 }
 
-// Clears and resets the autorealease pool if GLFW is managing it's own even loop,
-// and not using the built-in NSApplication event loop. GLFW creates it's own
-// autorelease pool only if it is running it's own event loop
+// Clears and resets the autorealease pool if GLFW is managing its own even loop,
+// and not using the built-in NSApplication event loop. GLFW creates its own
+// autorelease pool only if it is running its own event loop
 void _glfwResetAutoreleasePool()
 {
     if(!isNSApplicationRunning())

src/cocoa_platform.h

@@ -164,7 +164,7 @@ void _glfwRestoreVideoModeNS(_GLFWmonitor* monitor);
 
 // If GLFW is running as a stand-alone application, we create a global autorealease
 // pool. If GLFW is running in an existing native Cocoa app, the underlying
-// NSApplication creates it's own autorelease pool. These functions check if GLFW
+// NSApplication creates its own autorelease pool. These functions check if GLFW
 // is running in a Cocoa app or not, and creates the autorealease pool accordingly.
 // If GLFW is in a Cocoa app, these functions don't do anything
 void _glfwCreateAutoreleasePool();