Correct spelling error in StringUtils javadoc

Change-Id: Idd98530d5f6fca4de8631aa865e4bcd6e6cf9306
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

org.eclipse.jgit/src/org/eclipse/jgit/util/StringUtils.java

 /*
- * Copyright (C) 2009, Google Inc.
+ * Copyright (C) 2009-2010, Google Inc.
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
@@ -61,7 +61,7 @@ public final class StringUtils {
 	 * This method does not honor the JVM locale, but instead always behaves as
 	 * though it is in the US-ASCII locale. Only characters in the range 'A'
 	 * through 'Z' are converted. All other characters are left as-is, even if
-	 * they otherwise would have a lowercase character equivilant.
+	 * they otherwise would have a lowercase character equivalent.
 	 *
 	 * @param c
 	 *            the input character.
@@ -77,7 +77,7 @@ public static char toLowerCase(final char c) {
 	 * This method does not honor the JVM locale, but instead always behaves as
 	 * though it is in the US-ASCII locale. Only characters in the range 'A'
 	 * through 'Z' are converted, all other characters are left as-is, even if
-	 * they otherwise would have a lowercase character equivilant.
+	 * they otherwise would have a lowercase character equivalent.
 	 *
 	 * @param in
 	 *            the input string. Must not be null.