fix: typos in documentation files (#3186)

* Update CannotSubtractException.java

* Update CachingTest.java

* Update App.java

* Update caching.urm.puml

* Update update-method.urm.puml

caching/src/main/java/com/iluwatar/caching/App.java

@@ -133,7 +133,7 @@ public class App {
     LOGGER.info(splitLine);
     app.useReadThroughAndWriteBehindStrategy();
     LOGGER.info(splitLine);
-    app.useCacheAsideStategy();
+    app.useCacheAsideStrategy();
     LOGGER.info(splitLine);
   }
 
@@ -224,7 +224,7 @@ public class App {
   /**
    * Cache-Aside.
    */
-  public void useCacheAsideStategy() {
+  public void useCacheAsideStrategy() {
     LOGGER.info("# CachingPolicy.ASIDE");
     appManager.initCachingPolicy(CachingPolicy.ASIDE);
     LOGGER.info(appManager.printCacheContent());

caching/src/test/java/com/iluwatar/caching/CachingTest.java

@@ -68,6 +68,6 @@ class CachingTest {
   @Test
   void testCacheAsideStrategy() {
     assertNotNull(app);
-    app.useCacheAsideStategy();
+    app.useCacheAsideStrategy();
   }
 }