Doc update

Renamed area_by_triangles.hpp to area_surveyor.hpp because most files are named to their inventor or formula


[SVN r68370]

libs/geometry

@@ -1 +1 @@
-Subproject commit 62cdc829126659dea725d65d80bb5eb266424555
+Subproject commit 32d95d3d8ea81e434328cb90f34c3a1e6d9fe188