Fix httpsOnly config file example
`server.ssl.httpsOnly` doesn't do anything, the code references `server.httpsOnly`, so fix the docs.
@@ -110,7 +110,7 @@ server.defaultHeaders = true
server.maxRequestSize = 10485760
server.securePort = 8443
server.ssl.type = self-signed | PKCS12 | X509
-server.ssl.httpsOnly = false
+server.httpsOnly = false
server.http2 = true
server.expectContinue = false
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