cleanup: reformat defs.bzl doc string. (#1126)

The extraneous newlines were bothering me.
diff --git a/docs/python.md b/docs/python.md
index 6682e48..e42375a 100755
--- a/docs/python.md
+++ b/docs/python.md
@@ -1,9 +1,7 @@
 <!-- Generated with Stardoc: http://skydoc.bazel.build -->
 
-
 Core rules for building Python projects.
 
-
 <a id="current_py_toolchain"></a>
 
 ## current_py_toolchain
diff --git a/python/defs.bzl b/python/defs.bzl
index e106166..ec70c1b 100644
--- a/python/defs.bzl
+++ b/python/defs.bzl
@@ -11,10 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
-"""
-Core rules for building Python projects.
-"""
+"""Core rules for building Python projects."""
 
 load("@bazel_tools//tools/python:srcs_version.bzl", _find_requirements = "find_requirements")
 load(