fix: fix link

Author: JTorreG

source/community.rst

@@ -39,7 +39,7 @@ Reporting security concerns
 Please report any security-related issues concerning Unit to
 `security-alert@nginx.org <security-alert@nginx.org>`__.
 For our mutual convenience, specifically mention **NGINX Unit** in the subject and, if possible, provide a
-`CVSS score<https://www.first.org/cvss/>`__.
+`CVSS score <https://www.first.org/cvss/>`__.
 
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 Contributing