Code quality: Address Copilot review comments

All accesses to g_drdynvcs[] in chansrv.c have been checked for
unbounded access.

common/dechunker.c

@@ -439,7 +439,7 @@ dyn_dechunker_process_first_chunk(struct dyn_dechunker *self,
     }
     else if (frag_size == total_size)
     {
-        // This chunk ccontains all the data
+        // This chunk contains all the data
         status = E_DYN_INLINE_CHUNK;
     }
     else

common/dechunker.h

@@ -50,7 +50,7 @@ enum vc_dechunker_status
 };
 
 /**
- * Returned from dyn_dechunker_process_chunk() and
+ * Returned from dyn_dechunker_process_data_chunk() and
  * Returned from dyn_dechunker_process_first_chunk()
  */
 enum dyn_dechunker_status