fix typo

Author: natrem

CONTRIBUTING.adoc

@@ -17,7 +17,7 @@ please ask on https://stackoverflow.com[Stack Overflow]. The springdoc-openapi t
 broader community monitor the https://stackoverflow.com/tags/springdoc[`springdoc`]
 tag.
 
-These are some basic guidelines before opening an issue. First of all you need to make sure, you don't create duplicate issues, and there no question already answred on https://stackoverflow.com/tags/springdoc.
+These are some basic guidelines before opening an issue. First of all you need to make sure, you don't create duplicate issues, and there no question already answered on https://stackoverflow.com/tags/springdoc.
 
 If you are starting using springdoc-openapi, we advise you to use the last available release.