Changes in Documentation
diff --git a/scrapy/utils/defer.py b/scrapy/utils/defer.py
index aa6dcffda25..bcf20951165 100644
--- a/scrapy/utils/defer.py
+++ b/scrapy/utils/defer.py
@@ -11,7 +11,7 @@ def defer_fail(_failure):
     """Same as twisted.internet.defer.fail but delay calling errback until
     next reactor loop
 
-    It delays by 100ms so reactor has a chance to go trough readers and writers
+    It delays by 100ms so reactor has a chance to go through readers and writers
     before attending pending delayed calls, so do not set delay to zero.
     """
     d = defer.Deferred()

This is my first PR, so on going through the code, I found some typos, and corrected it.
Corrected Files: scrapy/utils/defer.py