[FAB-6279] Fix minor typos in documentation

Fix minor typos found in the following pages:
https://hyperledger-fabric.readthedocs.io/en/latest/fabric_model.html
https://hyperledger-fabric.readthedocs.io/en/latest/build_network.html

Change-Id: I562600eb7f3f3757785b68469e8b566ab63f892c
Signed-off-by: Dileban Karunamoorthy <dileban@gmail.com>

Author: dileban

docs/source/build_network.rst

@@ -324,7 +324,7 @@ Configuration Transaction Generator
 The ``configtxgen tool`` is used to create four configuration artifacts:
 
   * orderer ``genesis block``,
-  * channel ``channel configuration transaction``,
+  * channel ``configuration transaction``,
   * and two ``anchor peer transactions`` - one for each Peer Org.
 
 Please see :doc:`configtxgen` for a complete description of the use of this

docs/source/fabric_model.rst

@@ -46,7 +46,7 @@ Chaincode
 Chaincode is software defining an asset or assets, and the transaction instructions for
 modifying the asset(s).  In other words, it's the business logic.  Chaincode enforces the rules for reading
 or altering key value pairs or other state database information. Chaincode functions execute against
-the ledger current state database and are initiated through a transaction proposal. Chaincode execution
+the ledger's current state database and are initiated through a transaction proposal. Chaincode execution
 results in a set of key value writes (write set) that can be submitted to the network and applied to
 the ledger on all peers.