Fix php code block conflict

Author: hguthrie

src/_includes/config/split-deploy/example_update-prod.md

@@ -15,7 +15,7 @@ To update the production system:
 
 1. Stop any running queue workers by setting `cron_run` to `false` in `app/etc/env.php` as follows:
 
-   ```php
+   ```php?start_inline=1
    'cron_consumers_runner' => [
            'cron_run' => false
        ]

src/_videos/fundamentals/add-a-javascript-module.md

@@ -45,7 +45,7 @@ Now create two files:
 
 {% collapsible Show source code %}
 
-```php?start_inline=1
+```php
 <?php
 \Magento\Framework\Component\ComponentRegistrar::register(
     \Magento\Framework\Component\ComponentRegistrar::MODULE,

src/_videos/fundamentals/add-new-product-attribute.md

@@ -72,7 +72,7 @@ xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
 
 {% collapsible Show code %}
 
-```php?start_inline=1
+```php
 <?php
 /**
  * Copyright © 2016 Magento. All rights reserved.
@@ -97,7 +97,7 @@ Create the file `app/code/Learning/ClothingMaterial/Setup/InstallData.php`:
 
 {% collapsible Show code %}
 
-```php?start_inline=1
+```php
 <?php
 /**
  * Copyright © 2016 Magento. All rights reserved.
@@ -204,7 +204,7 @@ Next, we need to create the source model:
 
 {% collapsible Show code %}
 
-```php?start_inline=1
+```php
 <?php
 /**
  * Copyright © 2016 Magento. All rights reserved.
@@ -248,7 +248,7 @@ Now we will create a backend model:
 
 {% collapsible Show code %}
 
-```php?start_inline=1
+```php
 <?php
 /**
  * Copyright © 2016 Magento. All rights reserved.
@@ -295,7 +295,7 @@ And finally, we create a frontend model to make our value bold:
 
 {% collapsible Show code %}
 
-```php?start_inline=1
+```php
 <?php
 namespace Learning\ClothingMaterial\Model\Attribute\Frontend;
 

src/guides/v2.3/howdoi/checkout/checkout_new_field.md

@@ -27,7 +27,6 @@ Both shipping address and billing address forms are [generated dynamically]({{ p
 The following code snippet enumerates sample logic for adding a field named `Custom Attribute` to the shipping address form:
 
 ```php?start_inline=1
-<?php
 $customAttributeCode = 'custom_field';
 $customField = [
     'component' => 'Magento_Ui/js/form/element/abstract',

src/guides/v2.3/howdoi/checkout/checkout_payment_new_field.md

@@ -261,7 +261,7 @@ Then create the `app/code/Learning/CustomField/Observer/Frontend/Sales/OrderPaym
 
 {% collapsible Show code %}
 
-```php?start_inline=1
+```php
 <?php
 
 namespace Learning\CustomField\Observer\Frontend\Sales;