[FAB-8410] peer chaincode CLI documentation
[FAB-8410] peer chaincode CLI documentation

This CR adds documentation for the `peer chaincode` CLI commands.

Made some minor changes and descriptions.

Change-Id: I193a65317ca54e562ea0a3021d3b38f9366302a4
Signed-off-by: Will Lahti <f19a2779710675aad3df5c81e4ecfde11707e3aa@us.ibm.com>
Signed-off-by: Srinivasan Muralidharan <523c2042295185cd087fe3a05deea7bac4a627b2@gmail.com>

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