Add instructions on re-installing Plone add-ons.

Author: ksuess

docs/install/manage-add-ons-packages.md

@@ -185,7 +185,6 @@ make build-backend
 make start-backend
 ```
 
-
 In your web browser, and assuming you are currently logged in as `admin`, visit the URL http://localhost:8080/Plone/prefs_install_products_form.
 
 Then click the {guilabel}`Install` button to complete installation of `collective.easyform`.
@@ -196,8 +195,6 @@ At the bottom of the page, you should see the heading {guilabel}`Add-on Configur
 While visiting the home page, you can add a new `easyform` object.
 
 
-
-
 (manage-backend-pin-the-version-of-an-add-on)=
 
 ### Pin the version of an add-on
@@ -229,6 +226,10 @@ make build-backend
 make start-backend
 ```
 
+In your web browser, and assuming you are currently logged in as `admin`, visit the URL http://localhost:8080/Plone/prefs_install_products_form.
+
+Update your add-on.
+
 
 (manage-backend-check-out-an-add-on)=
 
@@ -264,6 +265,10 @@ make build-backend
 make start-backend
 ```
 
+In your web browser, and assuming you are currently logged in as `admin`, visit the URL http://localhost:8080/Plone/prefs_install_products_form.
+
+Update your add-on.
+
 
 (manage-backend-pin-the-version-of-a-plone-package-against-constraints-label)=