Add WEBAUTHN config option to the man page

miniflux.1

@@ -1,5 +1,5 @@
 .\" Manpage for miniflux.
-.TH "MINIFLUX" "1" "September 27, 2023" "\ \&" "\ \&"
+.TH "MINIFLUX" "1" "November 5, 2023" "\ \&" "\ \&"
 
 .SH NAME
 miniflux \- Minimalist and opinionated feed reader
@@ -507,9 +507,14 @@ Set a custom invidious instance to use\&.
 Default is yewtu.be\&.
 .TP
 .B PROXY_PRIVATE_KEY
-Set a custom custom private key used to sign proxified media url\&.
+Set a custom custom private key used to sign proxified media URL\&.
 .br
 Default is randomly generated at startup\&.
+.TP
+.B WEBAUTHN
+Enable or disable WebAuthn/Passkey authentication\&.
+.br
+Default is true\&.
 
 .SH AUTHORS
 .P