Add details for crypt_level=fips to man page

docs/man/xrdp.ini.5

@@ -54,7 +54,7 @@ If set to \fB0\fR, \fBfalse\fR or \fBno\fR this option disables all channels \fB
 See section \fBCHANNELS\fP below for more fine grained options.
 
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-\fBcrypt_level\fP=\fIlow|medium|high\fP
+\fBcrypt_level\fP=\fIlow|medium|high|fips\fP
 .\" <http://blogs.msdn.com/b/openspecification/archive/2011/12/08/encryption-negotiation-in-rdp-connection.aspx>
 RDP connection are controlled by two encryption settings: \fIEncryption Level\fP and \fIEncryption Method\fP.
 The only supported \fIEncryption Method\fP is \fB40BIT_ENCRYPTION\fP, \fB128BIT_ENCRYPTION\fP and \fB56BIT_ENCRYPTION\fP are currently not supported.
@@ -70,6 +70,10 @@ All data sent between the client and the server is protected by encryption based
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 .B high
 All data sent between the client and server is protected by encryption based on the server's maximum key strength.
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+.B fips
+All data sent between the client and server is protected using Federal Information Processing Standard 140-1 validated encryption methods.
+.I This level is required for Windows clients (mstsc.exe) if the client's group policy enforces FIPS-compliance mode.
 .RE
 
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