Remove experimental for modularizeImports from docs and example

[chibicode]

When modularizeImports was moved out of experiimental on this PR, docs and examples were not updated.

• Update modularize-imports example by removing experimental from next.config.js, as it's currently failing when deployed
• For docs: https://nextjs.org/docs/advanced-features/compiler#modularize-imports
  • Move Modularize Imports section outside of Experimental Features section
  • Remove experimental from code snippets
  • Added to version history, just like when SWC Minifier became stable.

Documentation / Examples

• Make sure the linting passes by running pnpm build && pnpm lint
• The "examples guidelines" are followed from our contributing doc

[chibicode]

Not sure if this change is necessary. I added it because there’s SWC Minifier stable 2 lines below, so I did something similar. But feel free to remove it if this isn’t necessary.