d updated markdown snippets

Author: actions-user

approvaltests/docs/how_to/ShowNullsInJson.md

@@ -13,5 +13,5 @@ here is an example on how to do that.
 Person person = new Person("Max", null, 1);
 JsonApprovals.verifyAsJson(person, GsonBuilder::serializeNulls);
 ```
-<sup><a href='/approvaltests-tests/src/test/java/org/approvaltests/JsonFormattingTest.java#L31-L34' title='Snippet source file'>snippet source</a> | <a href='#snippet-customgsonbuildershowingnull' title='Start of snippet'>anchor</a></sup>
+<sup><a href='/approvaltests-tests/src/test/java/org/approvaltests/JsonFormattingTest.java#L25-L28' title='Snippet source file'>snippet source</a> | <a href='#snippet-customgsonbuildershowingnull' title='Start of snippet'>anchor</a></sup>
 <!-- endSnippet -->

approvaltests/docs/reference/Verify.md

@@ -64,6 +64,7 @@ Approvals provides many convenience functions to verify different scenarios. Her
  * JsonApprovals. [verifyAsJson ](https://github.com/approvals/ApprovalTests.Java/blob/master/approvaltests/src/main/java/org/approvaltests/JsonApprovals.java#L25-L28) (Object)  
  * JsonApprovals. [verifyAsJson ](https://github.com/approvals/ApprovalTests.Java/blob/master/approvaltests/src/main/java/org/approvaltests/JsonApprovals.java#L29-L32) (Object,Function1)  
  * JsonApprovals. [verifyJson ](https://github.com/approvals/ApprovalTests.Java/blob/master/approvaltests/src/main/java/org/approvaltests/JsonApprovals.java#L17-L20) (String)  
+ * JsonJacksonApprovals. [verifyAsJson ](https://github.com/approvals/ApprovalTests.Java/blob/master/approvaltests/src/main/java/org/approvaltests/JsonJacksonApprovals.java#L10-L13) (Object)  
  * VelocityApprovals. [verify ](https://github.com/approvals/ApprovalTests.Java/blob/master/approvaltests/src/main/java/org/approvaltests/velocity/VelocityApprovals.java#L16-L19) (ContextAware)   <!-- endInclude -->
 
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