Repair formatting mistake

The previous changelog update contained a formatting mistake which is
corrected here.

doc/changes.rst

@@ -9,7 +9,7 @@ Changes since 4.1.5-beta1:
 Bugs fixed
 ----------
 * 1704_ - Reverted the docfix and made the fech_failed counter do
-what the documentation sais it should do
+  what the documentation sais it should do
 * 1865_ - Panic accessing beresp.backend.ip in vcl_backend_error
 * 2167_ - VCC will not parse a literal negative number where INT is
   expected