Fixed spelling in single-line comments.
diff --git a/src/http/ngx_http_parse_time.c b/src/http/ngx_http_parse_time.c
index 7d3aeae..3801df2 100644
--- a/src/http/ngx_http_parse_time.c
+++ b/src/http/ngx_http_parse_time.c
@@ -242,7 +242,7 @@
         year -= 1;
     }
 
-    /* Gauss' formula for Grigorian days since March 1, 1 BC */
+    /* Gauss' formula for Gregorian days since March 1, 1 BC */
 
     time = (uint64_t) (
             /* days in years including leap years since March 1, 1 BC */