[FAB-10658] Fix typo in uild_network.rst

Fix typo in docs/source/build_network.rst: "ouput" to "output"

Change-Id: Id5227de94ea480c090c0d95921191e10f9bad09d
Signed-off-by: Daisuke IIZUKA <daisuke.iizuka.ag@hitachi.com>

Author: Daisuke IIZUKA

docs/source/build_network.rst

@@ -462,7 +462,7 @@ set ``CHANNEL_NAME`` as an environment variable that can be used throughout thes
 
     export CHANNEL_NAME=mychannel  && ../bin/configtxgen -profile TwoOrgsChannel -outputCreateChannelTx ./channel-artifacts/channel.tx -channelID $CHANNEL_NAME
 
-You should see an ouput similar to the following in your terminal:
+You should see an output similar to the following in your terminal:
 
 .. code:: bash