Update Boutique Inventory introduction.md; Simple English grammar error correction

For example, if we have an array of hashes of animals, and we want extract the animals with short names, we might want to do something like: …"

Simple grammar error correction (the “to” is understood but to be proper, it needs to be included).

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Do you have others? Can you create a patch, link it here and link from there to here as well, just to complete the loop. I will notice either/both, but not everyone is in both places.

It will auto-close, but I will re-open (or someone may beat me to it), when it is linked.

The link to the pull request exercism/ruby#1665.