Common action copy updates (Shopify#11851)

Some of the language was open ended. Added some more specific examples
to the guidance.

.changeset/nine-humans-visit.md

@@ -0,0 +1,5 @@
+---
+'polaris.shopify.com': patch
+---
+
+Updated common action guidance.

polaris.shopify.com/content/patterns/common-actions/variants/best-practices.mdx

@@ -130,7 +130,7 @@ keywords:
 
     ![An image showing a card with primary and secondary buttons in the card footer.](/images/patterns/common-actions/common-actions-visual-hierarchy-filled-buttons@2x.png)
 
-    Use buttons with a contained or filled background to help merchants identify which action they’ll most likely want within a given view.
+    Use primary and secondary buttons to help merchants identify which action they’ll most likely want within a given view. See [card layout patterns](/patterns/card-layout#call-to-actions) for more information.
 
   </Medium>
 
@@ -146,7 +146,7 @@ keywords:
 
     ![An image showing a card with ten different actions using the secondary button style.](/images/patterns/common-actions/common-actions-visual-hierarchy-limit-contained-buttons@2x.png)
 
-    Use too many contained or filled buttons within a view as they can degrade hierarchy and cause confusion.
+    Avoid using more than two shaped or filled buttons within a card as they can degrade hierarchy and cause confusion.
 
   </Medium>
 

polaris.shopify.com/content/patterns/common-actions/variants/overview.mdx

@@ -70,7 +70,7 @@ url: /patterns/common-actions/overview
 
     ![A table of locations with the add action in the card header above the table.](/images/patterns/common-actions/types/common-action-types-add-table-top@2x.png)
 
-    Place add actions associated with a table in the card, table, or page header.
+    Place add actions associated with a table in the card, table, or page header. Use a secondary button when "Add" is the main action for a card that has a standalone table or list as its content.
 
   </Medium>