Fix typos detected by github.com/client9/misspell

(cherry picked from commit be211ceead)

spring-core/src/main/java/org/springframework/core/io/buffer/DataBuffer.java

@@ -192,7 +192,7 @@ public interface DataBuffer {
 	 * Write at most {@code length} bytes of the given source into this buffer, starting
 	 * at the current writing position of this buffer.
 	 * @param source the bytes to be written into this buffer
-	 * @param offset the index withing {@code source} to start writing from
+	 * @param offset the index within {@code source} to start writing from
 	 * @param length the maximum number of bytes to be written from {@code source}
 	 * @return this buffer
 	 */

spring-core/src/main/java/org/springframework/core/io/support/LocalizedResourceHelper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ import org.springframework.util.Assert;
  */
 public class LocalizedResourceHelper {
 
-	/** The default separator to use inbetween file name parts: an underscore */
+	/** The default separator to use in-between file name parts: an underscore. */
 	public static final String DEFAULT_SEPARATOR = "_";
 
 
@@ -60,7 +60,7 @@ public class LocalizedResourceHelper {
 	}
 
 	/**
-	 * Set the separator to use inbetween file name parts.
+	 * Set the separator to use in-between file name parts.
 	 * Default is an underscore ("_").
 	 */
 	public void setSeparator(@Nullable String separator) {