gce: Fix typo in docstring
gce: Fix typo in docstring

apache/libcloud,vongazman/libcloud,vongazman/libcloud,andrewsomething/libcloud,StackPointCloud/libcloud,StackPointCloud/libcloud,andrewsomething/libcloud,ByteInternet/libcloud,Scalr/libcloud,Kami/libcloud,vongazman/libcloud,ByteInternet/libcloud,mistio/libcloud,apache/libcloud,Kami/libcloud,mistio/libcloud,Kami/libcloud,StackPointCloud/libcloud,Scalr/libcloud,andrewsomething/libcloud,apache/libcloud,Scalr/libcloud,ByteInternet/libcloud,mistio/libcloud