remove trailing whitespace (#9)
diff --git a/docs/writing_stardoc.md b/docs/writing_stardoc.md
index ee76029..fa9cf06 100644
--- a/docs/writing_stardoc.md
+++ b/docs/writing_stardoc.md
@@ -58,7 +58,7 @@
<a name="provider-documentation"></a>
## Provider Documentation
-[Starlark Providers](https://docs.bazel.build/versions/master/skylark/rules.html#providers)
+[Starlark Providers](https://docs.bazel.build/versions/master/skylark/rules.html#providers)
are documented similarly to rules: using docstrings specified as parameters during
creation of the provider.