fix php code preview for multiple headings

MohammadWaleed · web-flow · commit c6910fd08c5d · 2019-03-06T11:38:30.000+02:00
diff --git a/3.1/exports/mapping.md b/3.1/exports/mapping.md
@@ -51,7 +51,7 @@ class InvoicesExport implements FromQuery, WithHeadings
 
 If you need to have multiple heading rows, you can return multiple rows from the `headings()` method:
 
-```
+
 ```php
 
 use Maatwebsite\Excel\Concerns\FromQuery;
@@ -68,4 +68,3 @@ class InvoicesExport implements FromQuery, WithHeadings
     }
 }
 ```
-``

Original file line number	Diff line number	Diff line change
`@@ -51,7 +51,7 @@ class InvoicesExport implements FromQuery, WithHeadings`
`51`	`51`
`52`	`52`	If you need to have multiple heading rows, you can return multiple rows from the `headings()` method:
`53`	`53`
`54`		-```
	`54`	`+`
`55`	`55`	```php
`56`	`56`
`57`	`57`	`use Maatwebsite\Excel\Concerns\FromQuery;`
`@@ -68,4 +68,3 @@ class InvoicesExport implements FromQuery, WithHeadings`
`68`	`68`	`}`
`69`	`69`	`}`
`70`	`70`	```
`71`		-``