docs(server-commands): fix typo in command to generate migrations

[nicolasrouanne]

• the command had --migration:generate instead of migration:generate written in the doc
• when copy pasting it we got this error

Not enough non-option arguments: got 0, need at least 1

• after removing the extra -- it worked as expected

[greptile-apps]

PR Summary

Fixed documentation typo in TypeORM migration command syntax to prevent copy-paste errors when generating new migrations.

• Updated command in packages/twenty-website/src/content/developers/backend-development/server-commands.mdx from --migration:generate to migration:generate to match correct TypeORM CLI syntax

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[FelixMalfait]

Thank you!

[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-f3d8aa13.json

Generated by 🚫 dangerJS against ee91630