Update sharepoint-design-manager-image-renditions.md (SharePoint#1493)

Author: aneethajayaraman

docs/general-development/sharepoint-design-manager-image-renditions.md

@@ -53,6 +53,7 @@ When an image rendition is created, SharePoint creates a unique ID that identifi
 
     > [!NOTE]
     > The Image Renditions page can also be opened from the default home page of the publishing site. In the **I'm the Visual Designer** section, choose **Configure image renditions**. 
+     
 
 4. On the **Image Renditions** page, choose **Add new item**.
 
@@ -90,8 +91,9 @@ When an image rendition is edited, the new dimensions take effect the next time
 
 
 5. On the **Edit Image Rendition** page, modify the name, width, or height of the image rendition.
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-  
+
+     > [!NOTE]
+  > To use the same image rendition on all webs within the same site collection, go to the image file directly and edit renditions from there. 
 
 ## Add an image rendition
 <a name="Add"> </a>