Improve Ale credits

Signed-off-by: Petr Horacek <petr@zlosynth.com>

manual/user/manual.tex

@@ -754,10 +754,11 @@ \section{Acknowledgments}
 and his contaigious enthusiasm about tape machines. Which sparked my initial
 ideas to create this module.
 
-TODO: Ale Moglia, aka Bartola Valves, for suggesting to extend this module's
-capabilities into looping territory and introducing me to Frippertronics.
+Ale Moglia, aka Bartola Valves\footnote{\url{https://www.bartola.co.uk/valves/}},
+for suggesting to extend this module's looping capabilities and introducing me
+to Frippertronics.
 
-\vspace{2.5cm}
+\vspace{0.5cm}
 
 \end{minipage}%
 \begin{minipage}{0.05\textwidth}