[Bugfix][Doc] Fix CI failure in docs (vllm-project#4804)

This PR fixes the CI failure introduced by vllm-project#4798.

The failure originates from having duplicate target names in reST, and is fixed by changing the ref targets to anonymous ones. For more information, see this discussion.

I have also changed the format of the links to be more distinct from each other.

docs/source/community/meetups.rst

@@ -5,8 +5,8 @@ vLLM Meetups
 
 We host regular meetups in San Francisco Bay Area every 2 months. We will share the project updates from the vLLM team and have guest speakers from the industry to share their experience and insights. Please find the materials of our previous meetups below:
 
-- `The third vLLM meetup <https://robloxandvllmmeetup2024.splashthat.com/>`_, with Roblox, April 2nd 2024, `slides <https://docs.google.com/presentation/d/1A--47JAK4BJ39t954HyTkvtfwn0fkqtsL8NGFuslReM/edit?usp=sharing>`_.
-- `The second vLLM meetup <https://lu.ma/ygxbpzhl>`_, with IBM Research, January 31st 2024, `slides <https://docs.google.com/presentation/d/12mI2sKABnUw5RBWXDYY-HtHth4iMSNcEoQ10jDQbxgA/edit?usp=sharing>`_, `video (vLLM Update) <https://youtu.be/Y0C-DUvEnZQ>`_, `video (IBM Research & torch.compile) <https://youtu.be/m0dMtFLI-dg>`_.
-- `The first vLLM meetup <https://lu.ma/first-vllm-meetup>`_, with a16z, October 5th, 2023, `slides <https://docs.google.com/presentation/d/1QL-XPFXiFpDBh86DbEegFXBXFXjix4v032GhShbKf3s/edit?usp=sharing>`_.
+- `The third vLLM meetup <https://robloxandvllmmeetup2024.splashthat.com/>`__, with Roblox, April 2nd 2024. `[Slides] <https://docs.google.com/presentation/d/1A--47JAK4BJ39t954HyTkvtfwn0fkqtsL8NGFuslReM/edit?usp=sharing>`__
+- `The second vLLM meetup <https://lu.ma/ygxbpzhl>`__, with IBM Research, January 31st 2024. `[Slides] <https://docs.google.com/presentation/d/12mI2sKABnUw5RBWXDYY-HtHth4iMSNcEoQ10jDQbxgA/edit?usp=sharing>`__ `[Video (vLLM Update)] <https://youtu.be/Y0C-DUvEnZQ>`__ `[Video (IBM Research & torch.compile)] <https://youtu.be/m0dMtFLI-dg>`__
+- `The first vLLM meetup <https://lu.ma/first-vllm-meetup>`__, with a16z, October 5th 2023. `[Slides] <https://docs.google.com/presentation/d/1QL-XPFXiFpDBh86DbEegFXBXFXjix4v032GhShbKf3s/edit?usp=sharing>`__
 
-We are always looking for speakers and sponsors at San Francisco Bay Area and potentially other locations. If you are interested in speaking or sponsoring, please contact us at `[email protected] <mailto:[email protected]>`_.
+We are always looking for speakers and sponsors at San Francisco Bay Area and potentially other locations. If you are interested in speaking or sponsoring, please contact us at `[email protected] <mailto:[email protected]>`__.