[FAB-8573] Put correct channel update doc in TOC

A merge reverted the TOC and put the wrong channel update doc in the
TOC.
[ci-skip]

Change-Id: I37ae3a5176b5c18eebfeed99a32c2b9404e2d8ab
Signed-off-by: joe-alewine <Joe.Alewine@ibm.com>

docs/source/index.rst

@@ -55,7 +55,7 @@ Business:
 
    build_network
    write_first_app
-   channel_update
+   channel_update_tutorial
    upgrading_your_network_tutorial
    chaincode
    chaincode4ade
@@ -69,10 +69,8 @@ Business:
 
    upgrade_to_one_point_one
    config_update
-   best_practices
    msp
    configtx
-   cc-packaging-and-signing
    endorsement-policies
    error-handling
    logging-control
@@ -143,4 +141,4 @@ Business:
    status
 
 .. Licensed under Creative Commons Attribution 4.0 International License
-   https://creativecommons.org/licenses/by/4.0/
+   https://creativecommons.org/licenses/by/4.0/