docs(README.md): Fix Query Examples 3 to avoid "Unsupported image model" error by kakakakakku · Pull Request #6 · awslabs/s3vectors-embed-cli

Issue #, if available: N/A Description of changes: Hi😀 Thanks for the useful CLI. I found that the Query Examples 3 in the README uses an jpeg file with the model amazon.titan-embed-text-v2:0, whic...