Rebuild the scope_exit documentation.

I didn't use the latest version which changes a file name and hasn't
been merged yet.

[SVN r63769]

libs/scope_exit

@@ -1 +1 @@
-Subproject commit 85948b66aa318b5f9d3dd1589cdee4f77ea49437
+Subproject commit fd2168edf87fbe2868420e072eccd2d4952e32e5