Update docs/example_paper.md

Co-authored-by: Warrick Ball <W.H.Ball@bham.ac.uk>

Author: arfon

docs/example_paper.md

@@ -101,7 +101,7 @@ complex multi-component systems and coordinate transformations. `Gala`'s design
 prioritizes making common operations simple while still enabling complex workflows through
 composition rather than configuration.
 
-# Research Impact Statement
+# Research impact statement
 
 `Gala` has demonstrated substantial research impact since its initial release. The package
 has been used in over 50 peer-reviewed publications spanning diverse topics in galactic