Update multimodal.md to exercise server as part of test

[mikekgfb]

Similar to #1384 to exercise the server , but for multimodal

1 - Run server: 1a - in background 1b - capture server_pid

2 - enable query using curl

3 - shutdown server with server pid captured in server_pid

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchchat/1391

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As of commit 45fa8ab1fffa1dc03c4a6e020cc5b8d706ea7278 with merge base b809b69e03f8f4b75a4b27b0778f0d3695ce94c2 (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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