"FeatureSpace advanced use cases" Keras code example - Fixing typos a…

[dimitreOliveira]

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This is related to the PR #1467 , I had some issues with my base branch after the latest release, so I had to create another fork and another merge.

Hi, I am the author of the FeatureSpace advanced use cases Keras code example, I am creating this PR to fix a typo and fix some other minor code formatting, that is the reason I am uploading all 3 files here.

For @MarkDaoust I generated all the files here and started the local Keras example page and everything is look fine with these files, here is a screenshot as how it is rendered here.