Typo Update get-support.mdx

[defitricks]

I found an issue with the list numbering in the Developer Support section. There were two items marked as "1.", which caused inconsistency in the ordered list format. For proper formatting and consistency, each item should have its own unique number (or the list can be changed to a bulleted list if the order is not important).

Issue:

1. Get help quickly in our [Developer Support repo](https://github.com/ethereum-optimism/developers/discussions).
1. See our [Developer Documentation](https://docs.optimism.io/) & [Tutorials](https://github.com/ethereum-optimism/optimism-tutorial).

Solution:

I updated the numbering to:

1. Get help quickly in our [Developer Support repo](https://github.com/ethereum-optimism/developers/discussions).
2. See our [Developer Documentation](https://docs.optimism.io/) & [Tutorials](https://github.com/ethereum-optimism/optimism-tutorial).

This change ensures proper list formatting and prevents confusion when reading the documentation.

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