docs: fix entity cache mermaid diagram (#6568)

docs/source/routing/performance/caching/entity.mdx

@@ -216,16 +216,15 @@ This entry contains an object with the `all` field to affect all subgraph reques
 You can invalidate entity cache entries with a [specifically formatted request](#invalidation-request-format once you [configure your router](#configuration) appropriately. For example, if price data changes before a price entity's TTL expires, you can send an invalidation request.
 
 ```mermaid
-
 flowchart RL
 	subgraph QueryResponse["Cache invalidation POST"]
 		n1["{
-			  "kind": "subgraph",
-			  "subgraph": "price",
-			  "type": "Price",
-			  "key": {
-			    "id": "101"
-			  }
+			    "kind": "subgraph",
+			    "subgraph": "price",
+			    "type": "Price",
+			    "key": {
+			        "id": "101"
+			    }
 		}"]
     end
 
@@ -236,18 +235,18 @@ flowchart RL
 	end
 
 	subgraph PriceQueryFragment["Price Query Fragment (e.g. TTL 2200)"]
-		n2[" ̶{̶
-    	  " ̶p̶r̶i̶c̶e̶":  ̶{̶
-            " ̶i̶d̶":  ̶1̶0̶1̶,
-            " ̶p̶r̶o̶d̶u̶c̶t̶_̶i̶d̶":  ̶1̶2̶,
-            " ̶a̶m̶o̶u̶n̶t̶":  ̶1̶5̶0̶0̶,
-            "̶c̶u̶r̶r̶e̶n̶c̶y̶_̶c̶o̶d̶e̶": " ̶U̶S̶D̶"
-    	   ̶}̶
-		 ̶}̶"]
+		n2["<del>{
+    	&nbsp;&nbsp;&nbsp;&nbsp;&quot;price&quot;: {
+        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;id&quot;: 101,
+        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;product_id&quot;: 12,
+        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;amount&quot;: 1500,
+        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&quot;currency_code&quot;: &quot;USD&quot;
+    	&nbsp;&nbsp;&nbsp;&nbsp;}
+		}</del>"]
 	end
 
 	Router
-	Database[("&emsp;&emsp;&emsp;")]
+	Database[("&nbsp;&nbsp;&nbsp;&nbsp;")]
 
     QueryResponse --> Router
 	Purchases --> Router