Updated release notes for v5.5.0
#### <sub><sup><a name="v550-note-29" href="#v550-note-29">:link:</a></sup></sub> fix
* Scrollbars have been given a touch of the Concourse design language. It should no longer use browser defaults. #4355
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+#### <sub><sup><a name="v550-note-30" href="#v550-note-30">:link:</a></sup></sub> fix
+
+* Build step headers are now sticky, staying at the top of the body on the build page instead of scrolling out of sight as you navigate long logs. This should make it easier to keep track of which step you're inspecting in complicated jobs. #4230
