Fix typo in fastrace post: multile -> multiple (#6)

Author: mstange

src/content/post/fastrace-a-modern-approach-to-distributed-tracing-in-rust.mdx

@@ -169,7 +169,7 @@ The consequences of missing context propagation are severe in distributed system
   Trace #3: API Gateway → Response
   ```
 
-- Even worse, when multile requests are interleaved, the traces become a chaotic mess:
+- Even worse, when multiple requests are interleaved, the traces become a chaotic mess:
   ```
   Trace #1: Frontend → API Gateway
   Trace #2: Frontend → API Gateway