docs(server-commands): fix typo in command to generate migrations (#9545

)

- 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

packages/twenty-website/src/content/developers/backend-development/server-commands.mdx

@@ -48,7 +48,7 @@ npx nx run twenty-server:database:reset
 #### For objects in Core/Metadata schemas (TypeORM)
 
 ```bash
-npx nx run twenty-server:typeorm --migration:generate src/database/typeorm/metadata/migrations/nameOfYourMigration -d src/database/typeorm/metadata/metadata.datasource.ts # replace by core data source if necessary
+npx nx run twenty-server:typeorm migration:generate src/database/typeorm/metadata/migrations/nameOfYourMigration -d src/database/typeorm/metadata/metadata.datasource.ts # replace by core data source if necessary
 ```
 
 #### For Workspace objects
@@ -98,4 +98,4 @@ Here's what the tech stack now looks like.
 **Development**
 - [AWS EKS](https://aws.amazon.com/eks/) 
 
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