minor fix to lambda function comment

Author: wing328

modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/TrimTrailingWhiteSpaceLambda.java

@@ -23,7 +23,7 @@
 import java.io.Writer;
 
 /**
- * Replaces duplicate line break characters in a fragment with single line break.
+ * Trim trailing white spaces in a fragment with single line break.
  * <p>
  * Register:
  * <pre>