typo in sherrifing docs
BUG=skia:
NOTRY=true
DOCS_PREVIEW= https://skia.org/?cl=1097353002
Review URL: https://codereview.chromium.org/1097353002
diff --git a/site/dev/sheriffing/index.md b/site/dev/sheriffing/index.md
index 0fa1687..052388c 100644
--- a/site/dev/sheriffing/index.md
+++ b/site/dev/sheriffing/index.md
@@ -33,7 +33,7 @@
* Start watching the [status page](https://status.skia.org) for bot breakages.
* Track down people responsible for breakages and revert broken changes if there is no easy fix.
* Close and open the [tree](http://skia-tree-status.appspot.com).
-* Keep the builder comments on the [status page](https://status.skia.org) upto date.
+* Keep the builder comments on the [status page](https://status.skia.org) up to date.
* File or follow up with [BreakingTheBuildbots bugs](https://code.google.com/p/skia/issues/list?q=label:BreakingTheBuildbots). See the tip on [when to file bugs](#when_to_file_bugs).
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