doc: optimize English text for better translation in vector search overview

[yahonda]

This PR optimizes the English text in ai/concepts/vector-search-overview.md to be more natural and to ensure better automatic translation into Japanese. Specifically, it changes 'You can choose any of the following ways for storage:' to 'You can store your data in either of the following ways:', which leads to a more natural Japanese translation.

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[gemini-code-assist]

Code Review

This pull request updates the vector search overview documentation to clarify data storage options. The reviewer suggested a further refinement to improve conciseness by removing unnecessary phrasing in the description of vector embeddings, aligning with the style guide's recommendation to avoid wordiness.

[yahonda]

The failure in the check-keywords job appears to be unrelated to the changes in this PR, as this PR only modifies ai/concepts/vector-search-overview.md and does not touch keywords.md or any related keyword definitions.