040124: Code example syntax fix for Eloquent Model Class page

[ccho-mongodb]

No JIRA
Code example fix (add quotes, update field name).
Staging:
https://preview-mongodbcchomongodb.gatsbyjs.io/laravel/040124-code-fix/eloquent-models/model-class/#customize-mass-assignment

Checklist

• Add tests and ensure they pass
• Add an entry to the CHANGELOG.md file
• Update documentation for new features

[rustagir]

left a non blocking fix

[rustagir]

I: based on the model definition and context, i think this is the correct field name
S:

Suggested change

	[ 'name' => 'Earth', 'gravity' => 9.8, 'day_length' => '24 hours' ],
	[ 'name' => 'Mars', 'gravity' => 3.7, 'day_length' => '25 hours' ],
	[ 'name' => 'Earth', 'gravitational_force' => 9.8, 'day_length' => '24 hours' ],
	[ 'name' => 'Mars', 'gravitational_force' => 3.7, 'day_length' => '25 hours' ],

[GromNaN]

We could prevent such errors by extracting this examples in dedicated .php files.