Fix grammar in docstring
Fix grammar in docstring

jeann2013/securedrop,ageis/securedrop,jrosco/securedrop,jeann2013/securedrop,jeann2013/securedrop,chadmiller/securedrop,heartsucker/securedrop,jeann2013/securedrop,harlo/securedrop,GabeIsman/securedrop,chadmiller/securedrop,ehartsuyker/securedrop,conorsch/securedrop,kelcecil/securedrop,GabeIsman/securedrop,GabeIsman/securedrop,GabeIsman/securedrop,ehartsuyker/securedrop,jrosco/securedrop,micahflee/securedrop,harlo/securedrop,harlo/securedrop,pwplus/securedrop,heartsucker/securedrop,jaseg/securedrop,jaseg/securedrop,heartsucker/securedrop,kelcecil/securedrop,garrettr/securedrop,ehartsuyker/securedrop,kelcecil/securedrop,micahflee/securedrop,kelcecil/securedrop,harlo/securedrop,chadmiller/securedrop,GabeIsman/securedrop,kelcecil/securedrop,harlo/securedrop,micahflee/securedrop,pwplus/securedrop,ageis/securedrop,jaseg/securedrop,jrosco/securedrop,garrettr/securedrop,conorsch/securedrop,jrosco/securedrop,conorsch/securedrop,pwplus/securedrop,chadmiller/securedrop,chadmiller/securedrop,jeann2013/securedrop,jrosco/securedrop,chadmiller/securedrop,jeann2013/securedrop,micahflee/securedrop,pwplus/securedrop,ehartsuyker/securedrop,pwplus/securedrop,kelcecil/securedrop,garrettr/securedrop,conorsch/securedrop,ageis/securedrop,harlo/securedrop,heartsucker/securedrop,garrettr/securedrop,ehartsuyker/securedrop,pwplus/securedrop,conorsch/securedrop,ehartsuyker/securedrop,GabeIsman/securedrop,heartsucker/securedrop,jaseg/securedrop,ageis/securedrop,jrosco/securedrop,jaseg/securedrop,jaseg/securedrop