Small doc-gen update, move from qbk{include,...} to qbk{[include ...]} to have greater flexibility (any qbk code can now be inlined)

[SVN r68304]

libs/geometry

@@ -1 +1 @@
-Subproject commit e116f5dddad2cbf86365d288709c074b91811e17
+Subproject commit cf7b735a1e45e2a107960028c5a7950d5c91ec20