Remove upgrade command and replace by flush

Signed-off-by: Jelle Deneweth <jelle.deneweth@gmail.com>

Author: pottink

docs/create-custom-content-type/workflow-tips.md

@@ -6,5 +6,5 @@ When you are working on a page and changing the master.html template, you need t
 
 ## Setup and cache
 
-If you change something in the configuration of your extension and the change is not visible, run `bin/magento setup:upgrade` to ensure that the configuration is updated.
+If you change something in the configuration of your extension and the change is not visible, run `bin/magento cache:flush` to ensure that the configuration is updated.
 

docs/extend-existing-content-type/step-3-extend-forms.md

@@ -93,7 +93,7 @@ The following table describes some key elements:
 | `settings` | Provides the markup that gives your field a label, CSS styling, validation, and other properties as needed. |
 {:style="table-layout:auto"}
 
-After adding the `max_height` field, run `bin/magento setup:upgrade`, run `bin/magento cache:clean`, drag a banner to the Admin stage, open the editor, and see your new style property field being rendered in the Banner's form, as shown here:
+After adding the `max_height` field`, run `bin/magento cache:clean`, drag a banner to the Admin stage, open the editor, and see your new style property field being rendered in the Banner's form, as shown here:
 
 ![Appearance fieldset](../images/appearance-fieldset.png){:width="934px" height="auto"}