Update .nitignore

Removed http.cookiejar.rst and http.server.rst from .nitignore

Author: lpyu001

Doc/tools/.nitignore

@@ -4,8 +4,6 @@
 
 Doc/library/ast.rst
 Doc/library/asyncio-extending.rst
-Doc/library/http.cookiejar.rst
-Doc/library/http.server.rst
 Doc/library/importlib.rst
 Doc/library/logging.config.rst
 Doc/library/logging.handlers.rst