[FAB-17421] Reword links to contract APIs and documentation

Hursley has asked that for 2.0 we drive users towards the
high level apis, so we've renamed the links and removed the link
to the Go low-level docs. See Heather's comment in the jira
for rationale.

Signed-off-by: pama-ibm <pama@ibm.com>

docs/source/getting_started.rst

@@ -23,17 +23,15 @@ After you have downloaded the Fabric Samples and Docker images to your local
 machine, you can get started working with Fabric with the
 :doc:`test_network` tutorial.
 
-Hyperledger Fabric smart contract (chaincode) SDKs
+Hyperledger Fabric smart contract (chaincode) APIs
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Hyperledger Fabric offers a number of SDKs to support developing smart contracts (chaincode)
-in various programming languages. Smart contract SDKs are available for Go, Node.js, and Java:
+Hyperledger Fabric offers a number of APIs to support developing smart contracts (chaincode)
+in various programming languages. Smart contract APIs are available for Go, Node.js, and Java:
 
-  * Go SDK documentation
-    * `Low-level <https://github.com/hyperledger/fabric-chaincode-go>`__.
-    * `High-level <https://github.com/hyperledger/fabric-contract-api-go>`__.
-  * `Node.js SDK <https://github.com/hyperledger/fabric-chaincode-node>`__ and `Node.js SDK documentation <https://fabric-shim.github.io/>`__.
-  * `Java SDK <https://github.com/hyperledger/fabric-chaincode-java>`__ and `Java SDK documentation <https://hyperledger.github.io/fabric-chaincode-java/>`__.
+  * `Go contract-api <https://github.com/hyperledger/fabric-contract-api-go>`__.
+  * `Node.js contract API <https://github.com/hyperledger/fabric-chaincode-node>`__ and `Node.js contract API documentation <https://fabric-shim.github.io/>`__.
+  * `Java contract API <https://github.com/hyperledger/fabric-chaincode-java>`__ and `Java contract API documentation <https://hyperledger.github.io/fabric-chaincode-java/>`__.
 
 Hyperledger Fabric application SDKs
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^