[Prettier Plugin] Improve compatibility docs

[lonix1]

The section Compatibility with other Prettier plugins should be improved.

One can use the prettier-plugin-merge to allow multiple plugins.

That plugin must be last:

plugins: [
  // other plugins...
  'prettier-plugin-svelte',
  'prettier-plugin-brace-style', // must be after svelte plugin
  'prettier-plugin-tailwindcss', // must be "as last as possible" so can modify output of previous supported plugins, must be after "prettier-plugin-svelte"
  'prettier-plugin-merge',       // must be last; needed when 2+ other plugins operate on same file type (same AST), or to fix incompatibilities introduced by "prettier-plugin-tailwindcss"
]

As you can see various plugins must be before or after some other one, so a blanket rule regarding ordering is not viable.

This is a real pain point. The plugin natively "fixes" compatibility with other major plugins, but the user will inevitably encounter a plugin that will cause prettier to stop working. In that case "prettier-plugin-merge" is the solution.