Update README.md.

Author: gk-brown

README.md

@@ -547,7 +547,7 @@ This code would produce the following output:
 ## TemplateEncoder
 The `TemplateEncoder` class transforms an object hierarchy (known as a "data dictionary") into an output format using a [template document](template-reference.md). Template syntax is based loosely on the [Mustache](https://mustache.github.io) specification and supports most Mustache features. 
 
-For example, this code applies a template named "example.html" to a map instance:
+For example, this code applies a template named _example.html_ to a map instance:
 
 ```java
 var map = mapOf(