Fix a few typos in the docs.
Fix a few typos in the docs.

ericgreenmix/marten,JasperFx/Marten,mysticmind/marten,mysticmind/marten,ericgreenmix/marten,JasperFx/Marten,mysticmind/marten,ericgreenmix/marten,mdissel/Marten,ericgreenmix/marten,mdissel/Marten,mysticmind/marten,JasperFx/Marten