Fix broken links and remove author template

Author: breandan

code_samples/gradle_plugin_demo/src/main/java/HelloAction.java

@@ -2,9 +2,6 @@
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.Messages;
 
-/**
- * Created by breandan on 11/25/2015.
- */
 public class HelloAction extends AnAction {
   public HelloAction() {
     super("Hello");

tutorials/custom_language_support/annotator.md

@@ -9,7 +9,7 @@ Annotator helps highlight and annotate any code based on specific rules.
 In this tutorial we will annotate usages of our properties within Java code.
 Let's consider a literal which starts with *"simple:"* as a usage of our property.
 
-```
+```java
 {% include /code_samples/simple_language_plugin/src/com/simpleplugin/SimpleAnnotator.java %}
 ```
 

tutorials/custom_language_support/reference_contributor.md

@@ -51,7 +51,7 @@ public static PsiElement getNameIdentifier(SimpleProperty element) {
 ### 10.3. Define an element factory
 
 ```java
-{% include /code_samples/simpleplugin/psi/impl/SimpleElementFactory.java %}
+{% include /code_samples/simple_language_plugin/src/com/simpleplugin/psi/SimpleElementFactory.java %}
 ```
 
 ### 10.4. Update grammar and regenerate the parser