Ruby: Fix title underline

hmac · hmac · commit 03ab3c1a5d8e · 2024-02-05T11:15:53.000Z
diff --git a/docs/codeql/codeql-language-guides/customizing-library-models-for-ruby.rst b/docs/codeql/codeql-language-guides/customizing-library-models-for-ruby.rst
@@ -35,7 +35,7 @@ See the `CLI documentation for how to load and use data extensions in a CodeQL e
 We'll explain how to use these using a few examples, and provide some reference material at the end of this article.
 
 Example: Taint sink in the 'tty-command' gem
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+--------------------------------------------
 
 In this example, we'll show how to add the following argument, passed to **tty-command**, as a command-line injection sink:
 
