Update how_to_upload_images.rst
Update how_to_upload_images.rst

fixed typo
gi11es/thumbor,gi11es/thumbor,thumbor/thumbor,kkopachev/thumbor,gi11es/thumbor,kkopachev/thumbor,scorphus/thumbor,scorphus/thumbor,scorphus/thumbor,scorphus/thumbor,voxmedia/thumbor,voxmedia/thumbor,okor/thumbor,kkopachev/thumbor,kkopachev/thumbor,thumbor/thumbor,okor/thumbor,okor/thumbor,voxmedia/thumbor,thumbor/thumbor,thumbor/thumbor