Grammar updates to 47.md

Minor grammatical edits for clarity.
- "It's" to "its" to show the possessive case intended instead of the contraction
- Correct article from "an" to "a" for the following d letter (consonant sound)
- Minor edit to fix comma splices with a semicolon ( ; ) to clarify two independent thoughts. Somewhat optional, but it clarifies the two long sentences. Period can instead be used instead as a new sentence.

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