about: list contributors alphabetically

Refs #67102

Change-Id: I564360cee2294e0569a473ff35962a7ee4b14b27

Credits.rtf

@@ -12,13 +12,14 @@
 
 \i0\b \cf0 Authors
 \i\b0 \
+Adrien B\'e9raud\
 Alexandre Lision\
-Guillaume Roguez\
+\'c9dric Ladent-Milaret\
 Eloi Bail\
-Adrien B\'e9raud\
-Thibault Cohen\
+Emmanuel Lepage-Vall\'e9e\
+Guillaume Roguez\
+Marianne Forget\
 Stepan Salenikovich\
-\'c9dric Ladent-Milaret\
 \
 Based on SFLphone's project\
 }