fixed sonarqube issues

docs/HORIZONTAL_SCALABILITY.md

@@ -18,7 +18,7 @@ Your authorization microservice is now **fully horizontally scalable** using Red
 
 #### 2. Cache Architecture
 
-```
+```text
 ┌─────────────┐     ┌─────────────┐     ┌─────────────┐
 │  Instance 1 │     │  Instance 2 │     │  Instance 3 │
 └──────┬──────┘     └──────┬──────┘     └──────┬──────┘
@@ -39,20 +39,20 @@ Your authorization microservice is now **fully horizontally scalable** using Red
 
 #### 3. Key Features
 
-**Dual-Layer Caching**
+#### Dual-Layer Caching
 
 - Primary: Redis (distributed, shared across instances)
 - Secondary: Local in-memory (failover, performance boost)
 - Automatic fallback when Redis unavailable
 
-**Consistency Guarantees**
+#### Consistency Guarantees
 
 - All instances share the same Redis cache
 - 30-second automatic cache refresh
 - Manual invalidation via `InvalidateUserCache()`
 - Force refresh via `RefreshCacheNow()`
 
-**Performance Optimizations**
+#### Performance Optimizations
 
 - JSON serialization for complex objects
 - 100ms timeout for Redis operations
@@ -313,7 +313,7 @@ var (
 | Medium Cluster  | 5         | ~10,000      | <20ms         |
 | Large Cluster   | 10+       | ~20,000+     | <25ms         |
 
-_Note: Assumes Redis on same network, PostgreSQL optimized_
+> **Note:** Assumes Redis on same network, PostgreSQL optimized
 
 ### Cache Effectiveness