Change of title - semantic search & fixed typo

[dinkofranceschi]

This is a great tutorial! I suggest changing title of beginner_colab to help with semantic search. I also fixed a typo I came across in intermediate_colab.

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[dinkofranceschi]

@googlebot I signed it!

[janpfeifer]

Thanks for the contribution.

The PR include several metadata changes, that we would rather not take in. Would you mind pointing out the change ? I'll do the change in our internal system and assign it to you.

(edited because of a misclick while writing it)

[dinkofranceschi]

Yes!

1. I suggest changing the title of beginner_colab in order to help with semantic search:
   Build, train and evaluate Random Forests and Gradient Boosted Trees with TensorFlow Decision Forests

2. Typo I came across in intermediate_colab in section "Build the models:"
   "apropriate" and "netrwork"