FAB-5149 Remove extraneous docs

There are still a couple of coming soon
and WIP docs which show up via search.
Some are no longer needed and some will
be addressed in the future.  For both cases
we should remove them for the release.

Change-Id: I8a890431c48200b16da4383b7781deb6ba49cdeb
Signed-off-by: Gari Singh <gari.r.singh@gmail.com>

docs/source/best_practices.rst

-Best Practices
-==============
-
-Coming soon...
-
-Intended to contain best practices and configurations for MSP, networks,
-ordering service, channels, ACL, stress, policies, chaincode
-development, functions, etc...
-
-.. Licensed under Creative Commons Attribution 4.0 International License
-   https://creativecommons.org/licenses/by/4.0/
-

docs/source/javasdk.rst

-Java SDK
-========
-
-[WIP] ...coming soon
-
-In the meantime, refer to the `Hyperledger Fabric SDK design
-doc <https://docs.google.com/document/d/1R5RtIBMW9fZpli37E5Li5_Q9ve3BnQ4q3gWmGZj6Sv4/edit#heading=h.z6ne0og04bp5>`__
-for more details on the APIs and specifications.
-
-OR
-
-Refer to the
-`fabric-sdk-java <https://github.com/hyperledger/fabric-sdk-java>`__
-repository in the Hyperledger community.
-
-.. Licensed under Creative Commons Attribution 4.0 International License
-   https://creativecommons.org/licenses/by/4.0/
-

docs/source/learn_chaincode.rst

-Learn to write chaincode
-========================
-
-[WIP] ...coming soon
-
-Teaches a developer how to write chaincode functions and implement the
-necessary interfaces to create generic assets.
-
-In the meantime, visit the learn chaincode repo
-`here <https://github.com/IBM-Blockchain/learn-chaincode>`__ to
-familiarize yourself with high level concepts and go code.
-
-.. Licensed under Creative Commons Attribution 4.0 International License
-   https://creativecommons.org/licenses/by/4.0/
-

docs/source/orderingservice.rst

-Ordering Service
-================
-
-[WIP] ...coming soon
-
-This topic will outline the role and functionalities of the ordering
-service, and explain its place in the broader network and in the lifecycle of a transaction.
-The v1 architecture has been designed such that the ordering service is the centralized point
-of trust in a decentralized network, but also such that the specific implementation of "ordering"
-(solo, kafka, BFT) becomes a pluggable component.
-
-Refer to the design document on a `Kafka-based Ordering
-Service <https://docs.google.com/document/d/1vNMaM7XhOlu9tB_10dKnlrhy5d7b1u8lSY8a-kVjCO4/edit>`__
-for more information on the default v1 implementation.
-
-.. Licensed under Creative Commons Attribution 4.0 International License
-   https://creativecommons.org/licenses/by/4.0/
-