Add String method and docs URL for CodeSecurity

Author: omerd

github/github-stringify_test.go

@@ -268,10 +268,16 @@ type SecretScanningValidityChecks struct {
 }
 
 // CodeSecurity represents the state of code security on a repository.
+//
+// GitHub API docs: https://docs.github.com/en/code-security/getting-started/github-security-features#available-with-github-code-security
 type CodeSecurity struct {
 	Status *string `json:"status,omitempty"`
 }
 
+func (c CodeSecurity) String() string {
+	return Stringify(c)
+}
+
 // List calls either RepositoriesService.ListByUser or RepositoriesService.ListByAuthenticatedUser
 // depending on whether user is empty.
 //