[FAB-7976]add Node.js CC interface links

Added a link to the Node.js shim document
https://fabric-shim.github.io/ where Node.js chaincode is used.
This will help application developers to understand the APIs 
and sample chaincodes.

Change-Id: I237abc376412dab195a357e314ce8a3e29b35c98
Signed-off-by: Min Luo <luomin_tokyotech@hotmail.com>

Author: luomin

docs/source/build_network.rst

@@ -149,7 +149,7 @@ Next, you can bring the network up with one of the following commands:
 
 The above command will compile Golang chaincode images and spin up the corresponding
 containers.  Go is the default chaincode language, however there is also support
-for Node.js chaincode.  If you'd like to run through this tutorial with node
+for `Node.js <https://fabric-shim.github.io/>`__ chaincode.  If you'd like to run through this tutorial with node
 chaincode, pass the following command instead:
 
 .. code:: bash

docs/source/dev-setup/build.rst

@@ -33,18 +33,18 @@ To run a specific test use the ``-run RE`` flag where RE is a regular
 expression that matches the test case name. To run tests with verbose
 output use the ``-v`` flag. For example, to run the ``TestGetFoo`` test
 case, change to the directory containing the ``foo_test.go`` and
-call/excecute
+call/execute
 
 ::
 
     go test -v -run=TestGetFoo
 
 
 
-Running Node.js Unit Tests
-~~~~~~~~~~~~~~~~~~~~~~~~~~
+Running Node.js Client SDK Unit Tests
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-You must also run the Node.js unit tests to insure that the Node.js
+You must also run the Node.js unit tests to ensure that the Node.js
 client SDK is not broken by your changes. To run the Node.js unit tests,
 follow the instructions
 `here <https://github.com/hyperledger/fabric-sdk-node/blob/master/README.md>`__.

docs/source/write_first_app.rst

@@ -107,7 +107,7 @@ chaincode written in Golang:
   ./startFabric.sh
 
 You also have the option of running this tutorial against chaincode written in
-Node.js.  If you'd like to pursue this route, issue the following command instead:
+`Node.js <https://fabric-shim.github.io/>`__.  If you'd like to pursue this route, issue the following command instead:
 
 .. code:: bash