docs: Fix display of navigation tiles in Fabric docs (#18733)

Author: awaelchli

docs/source-fabric/examples/index.rst

@@ -53,19 +53,22 @@ Examples
     :button_link: https://github.com/Lightning-AI/lightning/blob/master/examples/fabric/reinforcement_learning
     :col_css: col-md-4
     :height: 150
+    :tag: intermediate
 
 .. displayitem::
     :header: K-Fold Cross Validation
     :description: Cross validation helps you estimate the generalization error of a model and select the best one.
     :button_link: https://github.com/Lightning-AI/lightning/tree/master/examples/fabric/kfold_cv
     :col_css: col-md-4
     :height: 150
+    :tag: intermediate
 
 .. displayitem::
     :header: Active Learning
     :description: Coming soon
     :col_css: col-md-4
     :height: 150
+    :tag: intermediate
 
 
 .. raw:: html

docs/source-fabric/index.rst

@@ -110,7 +110,7 @@ Get Started
 
 .. raw:: html
 
-    <div class="tutorials-callout-container">
+    <div class="display-card-container">
         <div class="row">
 
 .. Add callout items below this line
@@ -170,6 +170,8 @@ Get Started
 
 .. End of callout item section
 
+|
+|
 
 .. raw:: html