Issue hyperledger-archives#103 item 5: Specify 'fabric'

I propose to change “perform the following command for each of the
Docker images:” to “perform the following command for each of the Fabric
docker images" because, if you just did Chapter 6, you would have all
the sawtooth images too & we don't mean for them to also tag those as
latest.

Likewise for the paragraph below that one.

Signed-off-by: nathalie-ckc <nathalie.ckc.123@gmail.com>

LFS171x/docs/introduction-to-hyperledger-fabric.md

@@ -434,13 +434,13 @@ The expected response is:
 |:--:|
 | *Licensed under [CC By 4.0](https://creativecommons.org/licenses/by/4.0/)* |
 
-**Note** the tags for each of the repositories above boxed in red. If the Docker images are not already tagged with the **latest** tag, perform the following command for each of the Docker images:
+**Note** the tags for each of the repositories above boxed in red. If the Docker images are not already tagged with the **latest** tag, perform the following command for each of the 'fabric' Docker images:
 
 ```
 $ docker tag hyperledger/fabric-tools:x86_64-1.0.2 hyperledger/fabric-tools:latest
 ```
 
-Swap out the <span style="color:blue">blue</span> portion with the tags you see in your list of repositories. Also, swap out the <span style="color:red">red</span> portion with the name of the Docker image you are switching the tag for (e.g.: **fabric-tools**, **fabric-ccenv**, **fabric-orderer**, etc.). Repeat this step for all Docker images you see in the list.
+Swap out the <span style="color:blue">blue</span> portion with the tags you see in your list of repositories. Also, swap out the <span style="color:red">red</span> portion with the name of the Docker image you are switching the tag for (e.g.: **fabric-tools**, **fabric-ccenv**, **fabric-orderer**, etc.). Repeat this step for all 'fabric' Docker images you see in the list.
 
 In the screenshot above, the Docker images are already tagged. If this is the case for you, you do not need to do this extra step.