design: use 'warning' instead of 'reprimand' in CoC

Update golang/go#13073

Change-Id: I4510cf890ae82e138bbf9bf92ea43d9065e019f6
Reviewed-on: https://go-review.googlesource.com/17021
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/design/13073-code-of-conduct.md b/design/13073-code-of-conduct.md
index 9994876..4e9a0b2 100644
--- a/design/13073-code-of-conduct.md
+++ b/design/13073-code-of-conduct.md
@@ -192,8 +192,7 @@
 * The group will reach a decision as to how to act. These may include:
    * Nothing.
    * A request for a private or public apology.
-   * A private reprimand from the working group to the individual(s) involved.
-   * A public reprimand.
+   * A private or public warning.
    * An imposed vacation (for instance, asking someone to "take a week off"
      from a mailing list or IRC).
    * A permanent or temporary ban from some or all Go spaces (mailing lists,