Update docfx.json

Fixing the folder name        
 "articles/azure-cache-for-redis/**/*.md": ["Azure","Cache for Redis"],
        "articles/azure-cache-for-redis/**/*.yml": ["Azure","Cache for Redis"],

Author: JasonWHowell

docfx.json

@@ -399,10 +399,10 @@
         "articles/industry/agriculture/**/*.md": "agriculture"
       },
       "searchScope": {
+        "articles/azure-cache-for-redis/**/*.md": ["Azure","Cache for Redis"],
+        "articles/azure-cache-for-redis/**/*.yml": ["Azure","Cache for Redis"],
         "articles/azure-databricks/**/*.md": ["Azure","Azure Databricks"],
         "articles/azure-databricks/**/*.yml": ["Azure","Azure Databricks"],
-        "articles/cache/**/*.md": ["Azure","Cache for Redis"],
-        "articles/cache/**/*.yml": ["Azure","Cache for Redis"],
         "articles/cosmos-db/**/*.md": ["Azure","Azure Cosmos DB"],
         "articles/cosmos-db/**/*.yml": ["Azure","Azure Cosmos DB"],
         "articles/data-catalog/**/*.md": ["Azure","Azure Data Catalog"],