Update intro-header.md

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@@ -143,7 +143,7 @@ Expanding on this single validation step, amendments can be run and their result
 
 ![Diagram of workflow with pre-amendment validation+measure phase, followed by amendment phase, followed by post-amendment validation-measure phase](workflow_two_iterations.svg)
 
-### 2.7 Implementations of Tests in the wild
+### 2.7 Implementations of Tests 'In the Wild'
 
 Not part of the BDQ Core standard, but implemented as part of the process of writing the standard, are a set of Java implementations of the BDQ Core tests which pass against the validation data.  See [9 Existing Test Implementations](../guide/implementers/index.md/#9-Existing-Test-Implementations-non-normative) in the implementer's guide for details.