[doc] Add missing space in urllib.request.rst (GH-19860)



This is just a typo fix, should I still provide news file?
diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index 03712c1..288ce14 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -1235,7 +1235,7 @@
 
     import urllib.request
     DATA = b'some data'
-    req = urllib.request.Request(url='http://localhost:8080', data=DATA,method='PUT')
+    req = urllib.request.Request(url='http://localhost:8080', data=DATA, method='PUT')
     with urllib.request.urlopen(req) as f:
         pass
     print(f.status)