Grammar fixes for observer

observer/README.md

@@ -21,10 +21,10 @@ dependents are notified and updated automatically.
 
 ## Explanation
 
-Real world example
+Real-world example
 
-> In a land far away lives the races of hobbits and orcs. Both of them are mostly outdoors so they 
-> closely follow the changes in weather. One could say that they are constantly observing the 
+> In a land far away live the races of hobbits and orcs. Both of them are mostly outdoors so they 
+> closely follow the weather changes. One could say that they are constantly observing the 
 > weather.
 
 In plain words
@@ -152,11 +152,7 @@ be changed.
 * When an object should be able to notify other objects without making assumptions about who these 
 objects are. In other words, you don't want these objects tightly coupled.
 
-## Typical Use Case
-
-* Changing in one object leads to a change in other objects.
-
-## Real world examples
+## Known uses
 
 * [java.util.Observer](http://docs.oracle.com/javase/8/docs/api/java/util/Observer.html)
 * [java.util.EventListener](http://docs.oracle.com/javase/8/docs/api/java/util/EventListener.html)

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

@@ -58,7 +58,7 @@ public static void main(String[] args) {
     weather.timePasses();
     weather.timePasses();
 
-    // Generic observer inspired by Java Generics and Collection by Naftalin & Wadler
+    // Generic observer inspired by Java Generics and Collections by Naftalin & Wadler
     LOGGER.info("--Running generic version--");
     var genericWeather = new GWeather();
     genericWeather.addObserver(new GOrcs());