Fix spelling (US).

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1477586 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/main/java/org/apache/commons/codec/language/Metaphone.java

@@ -36,8 +36,8 @@
  * <p>
  * This class is conditionally thread-safe.
  * The instance field {@link #maxCodeLen} is mutable {@link #setMaxCodeLen(int)}
- * but is not volatile, and accesses are not synchronised.
- * If an instance of the class is shared between threads, the caller needs to ensure that suitable synchronisation
+ * but is not volatile, and accesses are not synchronized.
+ * If an instance of the class is shared between threads, the caller needs to ensure that suitable synchronization
  * is used to ensure safe publication of the value between threads, and must not invoke {@link #setMaxCodeLen(int)}
  * after initial setup.
  *