Some README rendering corrections

Corrected sections without spaces
Best practice: add newline after section header

testing-modules/rest-assured/README.md

@@ -1,4 +1,5 @@
-###Relevant Articles:
+### Relevant Articles:
+
 - [A Guide to REST-assured](http://www.baeldung.com/rest-assured-tutorial)
 - [REST-assured Support for Spring MockMvc](https://www.baeldung.com/spring-mock-mvc-rest-assured)
 - [Getting and Verifying Response Data with REST-assured](https://www.baeldung.com/rest-assured-response)

testing-modules/rest-testing/README.md

@@ -2,10 +2,12 @@
 
 ## REST Testing and Examples
 
-###The Course
+### The Course
+
 The "REST With Spring" Classes: http://bit.ly/restwithspring
 
 ### Relevant Articles: 
+
 - [Introduction to WireMock](http://www.baeldung.com/introduction-to-wiremock)
 - [Using WireMock Scenarios](https://www.baeldung.com/wiremock-scenarios)
 - [REST API Testing with Cucumber](http://www.baeldung.com/cucumber-rest-api-testing)

testing-modules/xmlunit-2/README.md

@@ -1,2 +1,3 @@
-###Relevant Articles:
+### Relevant Articles:
+
 - [Introduction To XMLUnit 2.x](http://www.baeldung.com/xmlunit2)