Fix typo in toolchain support docs.

Bug: None
Change-Id: I90bdedef9aa8e22f19f9f62ae716e4335d7ba132
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2060069
Reviewed-by: Nico Weber <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Cr-Commit-Position: refs/heads/master@{#741964}
diff --git a/docs/toolchain_support.md b/docs/toolchain_support.md
index 7a60427e..d6e4ed4 100644
--- a/docs/toolchain_support.md
+++ b/docs/toolchain_support.md
@@ -86,7 +86,7 @@
   build: Provide commands on how to reproduce your problem, targeted at someone
   who knows the chromium build well but doesn't know your feature / platform
   at all.
-  - Tell us which repro to check out, if needed.
+  - Tell us which repo to check out, if needed.
   - Tell us which `args.gn` to use.
   - Tell us which target to build.
   - Tell us how to run your test.