Fix some grammar, spelling and indentation

Just some quick cleanup to make the code correctly formatted in parts
and fixed some typos.

java.html.markdown

@@ -337,7 +337,7 @@ public class LearnJava {
 	       validCodes.add("FINLAND");
         }
 
-        // But there's a nifty way to achive the same thing in an
+        // But there's a nifty way to achieve the same thing in an
         // easier way, by using something that is called Double Brace
         // Initialization.
 
@@ -347,9 +347,9 @@ public class LearnJava {
             add("FINLAND");
         }}
 
-        // The first brace is creating an new AnonymousInnerClass and the
-        // second one declares and instance initializer block. This block
-        // is called with the anonymous inner class is created.
+        // The first brace is creating a new AnonymousInnerClass and the
+        // second one declares an instance initializer block. This block
+        // is called when the anonymous inner class is created.
         // This does not only work for Collections, it works for all
         // non-final classes.
 
@@ -477,12 +477,12 @@ public interface Digestible {
 public class Fruit implements Edible, Digestible {
     @Override
   	public void eat() {
-		// ...
+  		// awesome code goes here
   	}
 
     @Override
   	public void digest() {
-		// ...
+  		// awesome code goes here
   	}
 }
 
@@ -492,10 +492,12 @@ public class ExampleClass extends ExampleClassParent implements InterfaceOne,
     InterfaceTwo {
     @Override
   	public void InterfaceOneMethod() {
+      // awesome code goes here
   	}
 
     @Override
   	public void InterfaceTwoMethod() {
+      // awesome code goes here
   	}
 }