Update .github/styles/custom/endash.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: paddyroddy

.github/styles/custom/endash.yml

@@ -1,6 +1,6 @@
 extends: existence
 message: "Avoid en dashes ('–'). For hyphenated words, use a hyphen ('-').\nFor
-  parenthesis, use an em dash ('—')."
+  parentheses, use an em dash ('—')."
 link: "https://github.com/DataDog/documentation/blob/master/CONTRIBUTING.md#dashes"
 nonword: true
 level: error