Standardize on American English spelling of 'behavior'.

src/changes/changes.xml

@@ -441,7 +441,7 @@ including bugfixes and test case improvements.">
 in high concurrency environments. Pools now provide a mechanism for tracking
 objects that have been borrowed from the pool but not returned. There have been
 numerous API changes to support these and other new features as well as to
-clarify behaviour and improve consistency across the API. This release requires
+clarify behavior and improve consistency across the API. This release requires
 JDK level 1.6 or above.">
     <action issue="POOL-211" dev="markt" type="add" due-to="Brad Koehn">
       Add support for proxy wrappers to ObjectPool and KeyedObjectPool. The
@@ -513,7 +513,7 @@ JDK level 1.6 or above.">
       remove deprecated code and unnecessary code.
     </action>
     <action dev="markt" type="update">
-      Introduce an Enum (WhenExhaustedAction) to control pool behaviour when no
+      Introduce an Enum (WhenExhaustedAction) to control pool behavior when no
       more objects are available to allocate.
     </action>
     <action dev="markt" type="update">

src/main/java/org/apache/commons/pool2/KeyedObjectPool.java

@@ -156,7 +156,7 @@ default void addObjects(final K key, final int count) throws Exception, IllegalA
      * instance in the first place.
      * </p>
      * <p>
-     * The behaviour of this method when the pool has been exhausted is not
+     * The behavior of this method when the pool has been exhausted is not
      * strictly specified (although it may be specified by implementations).
      * </p>
      *

src/main/java/org/apache/commons/pool2/ObjectPool.java

@@ -106,7 +106,7 @@ default void addObjects(final int count) throws Exception {
      * method as defined in an implementation or sub-interface.
      * </p>
      * <p>
-     * The behaviour of this method when the pool has been exhausted
+     * The behavior of this method when the pool has been exhausted
      * is not strictly specified (although it may be specified by
      * implementations).
      * </p>

src/main/java/org/apache/commons/pool2/impl/BaseGenericObjectPool.java

@@ -281,14 +281,14 @@ public final void setMaxWaitMillis(final long maxWaitMillis) {
     }
 
     /**
-     * Returns whether the pool has LIFO (last in, first out) behaviour with
+     * Returns whether the pool has LIFO (last in, first out) behavior with
      * respect to idle objects - always returning the most recently used object
      * from the pool, or as a FIFO (first in, first out) queue, where the pool
      * always returns the oldest object in the idle object pool.
      *
-     * @return {@code true} if the pool is configured with LIFO behaviour
+     * @return {@code true} if the pool is configured with LIFO behavior
      *         or {@code false} if the pool is configured with FIFO
-     *         behaviour
+     *         behavior
      *
      * @see #setLifo
      */
@@ -308,14 +308,14 @@ public final boolean getFairness() {
     }
 
     /**
-     * Sets whether the pool has LIFO (last in, first out) behaviour with
+     * Sets whether the pool has LIFO (last in, first out) behavior with
      * respect to idle objects - always returning the most recently used object
      * from the pool, or as a FIFO (first in, first out) queue, where the pool
      * always returns the oldest object in the idle object pool.
      *
      * @param lifo  {@code true} if the pool is to be configured with LIFO
-     *              behaviour or {@code false} if the pool is to be
-     *              configured with FIFO behaviour
+     *              behavior or {@code false} if the pool is to be
+     *              configured with FIFO behavior
      *
      * @see #getLifo()
      */