Tweak .gitignore to more safely ignore top level docs/

git itself had no problem here but downstream tools reading .gitignore
don't always honor the !sites/docs correctly, leading to repo searches
overlooking that dir :(

Author: bitprophet

.gitignore

@@ -3,9 +3,8 @@ build/
 dist/
 .tox/
 paramiko.egg-info/
-docs/
+/docs/
 demos/*.log
-!sites/docs
 _build
 .coverage
 .cache