docs(next-config): extend phase lines reference (#31711)

Next config `phase` attribute's default value list has been extended. This PR extends the number of referenced lines in the documentation.

## Documentation / Examples

- [x] Make sure the linting passes by running `yarn lint`

docs/api-reference/next.config.js/introduction.md

@@ -48,7 +48,7 @@ module.exports = (phase, { defaultConfig }) => {
 }
 ```
 
-`phase` is the current context in which the configuration is loaded. You can see the [available phases](https://github.com/vercel/next.js/blob/canary/packages/next/shared/lib/constants.ts#L1-L4). Phases can be imported from `next/constants`:
+`phase` is the current context in which the configuration is loaded. You can see the [available phases](https://github.com/vercel/next.js/blob/canary/packages/next/shared/lib/constants.ts#L1-L5). Phases can be imported from `next/constants`:
 
 ```js
 const { PHASE_DEVELOPMENT_SERVER } = require('next/constants')