Minor documentation formatting and wording improvement in README

[24ds1000054-code]

This PR makes two small improvements to the README:

• Removes trailing whitespace after a sentence
• Improves wording in one sentence for readability

No functional changes.

AI assistance was used only to help draft the wording, and the changes were verified manually.

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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