More docstring fixes

6 jobs for master in 360 minutes and 56 seconds (queued for 3 seconds)
Name Stage Failure
failed
job_clang_py2_amd64 Test
checking for exit in -lboost_thread... yes
checking for __gmpz_init in -lgmp... yes
checking for __gmpz_init in -lgmp... (cached) yes
checking whether CGAL is available in /usr... yes
checking whether to enable cgal debbuging with valgrind... no
checking python2.7 module: numpy... yes
checking for numpy/arrayobject.h... no
configure: error: Numpy extension header not found
ERROR: Job failed: exit status 1
failed
job_gcc_py2_amd64 Test

Doctest summary
===============
1059 tests
3 failures in tests
0 failures in setup code
0 failures in cleanup code
build finished with problems, 27 warnings.
ERROR: Job failed: exit status 1