Fixed typos

src/test/java/mattrixwv/CipherStreamJava/TestPlayfair.java

@@ -51,7 +51,7 @@ public class TestPlayfair{
 		output = cipher.decode(keyword, inputString);
 		assertEquals("Playfair failed symbol decoding.", correctOutput, output);
 
-		//Test mixed case, whtiespace, symbol decoding
+		//Test mixed case, whitespace, symbol decoding
 		inputString = "Bmod zbx dnab ek - udm@uixmm+ouvif";
 		keyword = "Playfair Example";
 		correctOutput = "Hide the gold in - the@trexe+stump";