docs: document base64 prefill credentials

docs/man/xrdp.ini.5.in

@@ -274,15 +274,20 @@ The name displayed in \fBxrdp\fR(8) login window's combo box.
 Sets the library to be used with this connection.
 
 .TP
-\fBusername\fR=\fI<username>\fR|\fIask\fR
+\fBusername\fR=\fI<username>\fR|\fI{base64}<base64-encoded-username>\fR|\fIask\fR
 Specifies the username used for authenticating in the connection.
 If set to \fIask\fR, user name should be provided in the login window.
 
+If the username includes comment out symbols such as '!', '#', or ';', the username can be
+provided in base64 form prefixing "{base64}".
+
 .TP
-\fBpassword\fR=\fI<password>\fR|\fIask\fR
+\fBpassword\fR=\fI<password>\fR|\fI{base64}<base64-encoded-password>\fR|\fIask\fR
 Specifies the password used for authenticating in the connection.
 If set to \fIask\fR, password should be provided in the login window.
 
+This parameter can be provided in base64 form as well as username. See also examples below.
+
 .TP
 \fBip\fR=\fI127.0.0.1\fR
 Specifies the ip address of the host to connect to.
@@ -310,13 +315,22 @@ This is an example \fBxrdp.ini\fR:
 bitmap_cache=true
 bitmap_compression=true
 
-[vnc1]
-name=sesman
-lib=../vnc/libvnc.so
+[Xorg]
+name=Xorg
+lib=libxup.so
 username=ask
 password=ask
 ip=127.0.0.1
-port=\-1
+port=-1
+code=20
+
+[vnc-any]
+name=vnc-any
+lib=libvnc.so
+ip=ask
+port=ask5900
+username=na
+password={base64}cGFzc3dvcmQhCg==
 .fi
 
 .SH "FILES"