docs: render deferToThread example as code

Prior to this change, the documentation was not rendering this example as a code block. The documentation simply displayed indented text here. Add a double-colon to signify that this is code.
kwahome · Mar 24, 2018 · 95ac848 · 95ac848
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diff --git a/docs/core/howto/threading.rst b/docs/core/howto/threading.rst
@@ -99,6 +99,8 @@ When we run some code, we often want to know what its result was.  For this, Twi
 
 To get a result from some blocking code back into the reactor thread, we can use :api:`twisted.internet.threads.deferToThread <deferToThread>` to execute it instead of callFromThread.
 
+::
+
     from __future__ import print_function
     from twisted.internet import reactor, threads
 

diff --git a/src/twisted/newsfragments/9396.misc b/src/twisted/newsfragments/9396.misc
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@@ Expand Up @@
     To get a result from some blocking code back into the reactor thread, we can use :api:`twisted.internet.threads.deferToThread <deferToThread>` to execute it instead of callFromThread.
+    ::
         from __future__ import print_function
         from twisted.internet import reactor, threads
@@ Expand Down @@