remove spurious ellipsis

Author: tbrowder

CONTRIBUTING.md

@@ -38,7 +38,7 @@ in the [#perl6 IRC channel](https://perl6.org/community/irc).
 * Duplicate small pieces of information rather than rely on linking
 * Be explicit about routine signatures. If a method accepts a `*%args`,
   but treats some of them specially, list them separately.
-* Check out [the styleguide](STYLEGUIDE.md) for further ... guidance
+* Check out [the styleguide](STYLEGUIDE.md) for further guidance
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