Improve clarity in README.md descriptions

[monokkai]

Summary

This PR fixes minor grammar and syntax issues in the Jest README to improve clarity and readability for developers.
The following changes were made:
In the Developer Ready section, added “that” to complete the sentence: changed “Works out of the box for most JavaScript projects” to “that works out of the box for most JavaScript projects.”
In the Instant Feedback section, improved sentence structure by adding “The” and “that”: changed “Fast, interactive watch mode only runs test files related to changed files” to “The fast, interactive watch mode that only runs test files related to changed files.”
In the Snapshot Testing section, removed a redundant “to” for smoother readability: changed “to simplify testing and to analyze how they change over time” to “to simplify testing and analyze how they change over time.”
Minor punctuation improvement in the instructions for running tests: added a comma and “following” to make the sentence clearer.

These edits enhance the readability and professionalism of the README without changing any technical instructions.

Test plan

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commit: d514d39

[cpojer]

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