Normalize whitespace in cache reference doc

spring-framework-reference/src/cache.xml

@@ -23,7 +23,7 @@
 	A buffer is used traditionally as an intermediate temporary store for data between a fast and a slow entity. As one
 	party would have to <emphasis>wait</emphasis> for the other affecting performance, the buffer alleviates this by
 	allowing entire blocks of data to move at once rather then in small chunks. The data is written and read only once from
-	the buffer.	Further more, the buffers are <emphasis>visible</emphasis> to at least one party which is aware of it.</para>
+	the buffer. Furthermore, the buffers are <emphasis>visible</emphasis> to at least one party which is aware of it.</para>
 	<para>A cache on the other hand by definition is hidden and neither party is aware that caching occurs.It as well improves
 	performance but does that by allowing the same data to be read multiple times in a fast fashion.</para>