Style: Remove inconsistently used @author docstrings

Each file in Godot has had multiple contributors who co-authored it over the
years, and the information of who was the original person to create that file
is not very relevant, especially when used so inconsistently.

`git blame` is a much better way to know who initially authored or later
modified a given chunk of code, and most IDEs now have good integration to
show this information.

modules/navigation/nav_map.cpp

@@ -36,10 +36,6 @@
 
 #include <algorithm>
 
-/**
-	@author AndreaCatania
-*/
-
 #define THREE_POINTS_CROSS_PRODUCT(m_a, m_b, m_c) (((m_c) - (m_a)).cross((m_b) - (m_a)))
 
 void NavMap::set_up(Vector3 p_up) {