Fix typo (#476)

Author: danmcp

serving/debugging-application-issues.md

@@ -80,7 +80,7 @@ If you see other conditions, to debug further:
      [Error Conditions and Reporting](https://github.com/knative/serving/blob/master/docs/spec/errors.md). Note: some of them
      are not implemented yet. An alternative is to
      [check Pod status](#check-pod-status).
-* If you are using `BUILD` to deploy and the `BuidComplete` condition is not
+* If you are using `BUILD` to deploy and the `BuildComplete` condition is not
      `True`, [check BUILD status](#check-build-status).
 
 ## Check Pod status