docs: Add comment explaining why conditional headers are skipped when override is true

Co-authored-by: arthurfiorette <47537704+arthurfiorette@users.noreply.github.com>

src/interceptors/request.ts

@@ -182,6 +182,9 @@ export function defaultRequestInterceptor(axios: AxiosCacheInstance): RequestInt
         config
       );
 
+      // Skip adding conditional headers (If-None-Match, If-Modified-Since) when override is true.
+      // The override option is meant to bypass cache and get fresh data, not revalidate existing cache.
+      // Adding conditional headers would cause the server to return 304 Not Modified instead of fresh data.
       if ((cache.state === 'stale' || cache.state === 'must-revalidate') && !overrideCache) {
         updateStaleRequest(cache, config as ConfigWithCache<unknown>);