buffer docs and small buffer changed

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+## buffer
+
+thread.buffer(V)
+
+a buffer is a container that allows a variable to be shared between threads & states in a thread safe manor.
+
+it is able to store 'anything' though lightuserdata will likely not work properly. poorly structured user data may retain some shared state with the original, which could cause some use-after-free in some really poor situations. providing a __copy metamethod will alleviate this issue (read more in readme.md)
+
+the __gc metamethod will be stripped from the original object and called when the buffer's __gc gets called. you should not reuse the original object after putting in a buffer for this reason.
+
+the __index metamethod will index any value that is not a buffer.* method on the original object (i will try not to add any more)
+
+every other metamethod will be replaced with a proxy to the metamethod in the copied object
+
+### buffer:get
+
+buffer:get()
+
+copies the value in the buffer to the current state
+
+### buffer:set
+
+buffer:set(V)
+
+sets the value in the buffer
+
+### buffer:mod
+
+buffer:mod(function(V))
+
+takes a function with a single argument (the value), the return value of this will be the new value, if it is nil, the value will return unchanged