Fix a documentation typo introduced in revision 0cfc90d5bf3a.
Fix a documentation typo introduced in revision 0cfc90d5bf3a.

zaccharles/nodatime,jskeet/nodatime,BenJenkinson/nodatime,jskeet/nodatime,malcolmr/nodatime,nodatime/nodatime,malcolmr/nodatime,zaccharles/nodatime,BenJenkinson/nodatime,malcolmr/nodatime,zaccharles/nodatime,nodatime/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,malcolmr/nodatime