Add filename output to clarify first loop example

[ndporter]

Added "echo $filename" within initial loop example to make it easier to visualize in the output exactly where each line of output is coming from. While this adds a little complexity, it reduces potential for confusion.

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[deppen8]

I think I am in favor of this, but the "Follow the Prompt" section below the code box would need to be updated as well.

[knarrff]

With the new pull request mentioned above (against the original pull request) I attempted to fulfill the request by @deppen8. Please see if this is sufficient.

[ndporter]

That looks like it takes care of it. Thanks @deppen8 for the notice and @knarrff for the update. This looks ready to merge to me.

[bkmgit]

Thanks.