Move app and support class docs from libbe to libroot.

Also a few more style and spelling fixes.

docs/user/app/MessageQueue.dox

@@ -21,17 +21,18 @@
 /*!
 	\class BMessageQueue
 	\ingroup app
+	\ingroup libroot
 	\brief A container that maintains a queue of messages.
-	
+
 	This class is used by BLooper to maintain a queue of messages that need to
 	be processed. This class has been designed as a first in, first out
 	container.
-	
+
 	The default message handling of a BLooper probably suffices for most uses,
 	but if you want more control, you can perform operations using the methods
 	of this class. Use BLooper::MessageQueue() to retrieve the specific
 	BMessageQueue instance. 
-	
+
 	Note that you are encouraged to make sure that whichever operation you
 	perform, that you only do this after the object has been locked (see
 	Lock()). The most important method, NextMessage() will fail if you have not
@@ -67,7 +68,7 @@
 	The message has to be allocated on the heap with \c new, because the queue
 	claims ownership of the message. Messages that were constructed on the
 	stack will corrupt the queue.
-	
+
 	Because a BMessageQueue claims ownership of the \a message, it is important
 	that the message does not belong to another BMessageQueue.
 */
@@ -76,7 +77,7 @@
 /*!
 	\fn void BMessageQueue::RemoveMessage(BMessage* message)
 	\brief Remove a \a message from the queue.
-	
+
 	If the \a message is indeed associated with this queue, it is removed from
 	it. This effectively means that you regain ownership of the message.
 */
@@ -97,9 +98,9 @@
 /*!
 	\fn BMessage *BMessageQueue::FindMessage(int32 index) const
 	\brief Retrieve the message at the \a index of this queue.
-	
+
 	\param index A zero-based index of the message you want to retrieve.
-	
+
 	\return A pointer to a message, or \c NULL if the \a index is out of
 		bounds.
 	\see FindMessage(uint32, int32) for a variant that takes a specific \c what
@@ -114,7 +115,7 @@
 
 	\param index A zero-based index of the message you want to retrieve.
 	\param what The \a what code of the message.
-	
+
 	\return A pointer to a message, or \c NULL if there is no message at the
 		\a index with that \a what constant, or if the \a index is out of
 		bounds.
@@ -124,7 +125,7 @@
 /*!
 	\fn bool BMessageQueue::Lock()
 	\brief Lock the queue so no other thread can perform operations on it.
-	
+
 	\see Unlock()
 */
 
@@ -132,7 +133,7 @@
 /*!
 	\fn void BMessageQueue::Unlock()
 	\brief Unlock the queue after a Lock() request.
-	
+
 	\see Lock()
 */
 
@@ -148,10 +149,10 @@
 /*!
 	\fn BMessage *BMessageQueue::NextMessage()
 	\brief Remove the first BMessage on the queue and return it to the caller.
-	
+
 	After calling this method, you get the ownership of the message, so make
 	sure it is deleted after you are done.
-	
+
 	\return A pointer to a message, or \c NULL if the queue is empty, or the
 		object has not been properly locked.
 	\see Lock()