docs: Regenerate all manpages using mmark (#2762)

Mmark recently became able to create manual pages. This removed the
dependency on 'ronn' and just uses mmark (Go program).

Re-hookup Makefile.doc to generate the correct header mmark needs to
see and regenate them all.

Spot checking a few pages suggest they look good and actually better
than rendered with ronn, esp. lists in lists.

Fixes #2757

Signed-off-by: Miek Gieben <miek@miek.nl>

man/coredns-federation.7

@@ -1,73 +1,78 @@
-.\" generated with Ronn/v0.7.3
-.\" http://github.com/rtomayko/ronn/tree/0.7.3
-.
-.TH "COREDNS\-FEDERATION" "7" "March 2019" "CoreDNS" "CoreDNS plugins"
-.
-.SH "NAME"
-\fIfederation\fR \- enables federated queries to be resolved via the kubernetes plugin\.
-.
-.SH "DESCRIPTION"
-Enabling this plugin allows Federated \fIhttps://kubernetes\.io/docs/tasks/federation/federation\-service\-discovery/\fR queries to be resolved via the kubernetes plugin\.
-.
-.P
-Enabling \fIfederation\fR without also having \fIkubernetes\fR is a noop\.
-.
-.SH "SYNTAX"
-.
-.nf
+.\" Generated by Mmark Markdown Processer - mmark.nl
+.TH "COREDNS-FEDERATION" "7" "April 2019" "CoreDNS" "CoreDNS Plugins"
 
-federation [ZONES\.\.\.] {
+.SH FEDERATION
+.SH NAME
+.PP
+\fIfederation\fP - enables federated queries to be resolved via the kubernetes plugin.
+
+.SH DESCRIPTION
+.PP
+Enabling this plugin allows
+Federated
+\[la]https://kubernetes.io/docs/tasks/federation/federation-service-discovery/\[ra] queries to be
+resolved via the kubernetes plugin.
+
+.PP
+Enabling \fIfederation\fP without also having \fIkubernetes\fP is a noop.
+
+.SH SYNTAX
+.PP
+.RS
+
+.nf
+federation [ZONES...] {
     NAME DOMAIN
     upstream
 }
-.
-.fi
-.
-.IP "\(bu" 4
-Each \fBNAME\fR and \fBDOMAIN\fR defines federation membership\. One entry for each\. A duplicate \fBNAME\fR will silently overwrite any previous value\.
-.
-.IP "\(bu" 4
-\fBupstream\fR [\fBADDRESS\fR\.\.\.] resolve the \fBCNAME\fR target produced by this plugin\. CoreDNS will resolve External Services against itself\.
-.
-.IP "" 0
-.
-.SH "EXAMPLES"
-Here we handle all service requests in the \fBprod\fR and \fBstage\fR federations\.
-.
-.IP "" 4
-.
-.nf
 
-\&\. {
-    kubernetes cluster\.local
-    federation cluster\.local {
-        prod prod\.feddomain\.com
-        staging staging\.feddomain\.com
+.fi
+.RE
+
+.IP \(bu 4
+Each \fBNAME\fP and \fBDOMAIN\fP defines federation membership. One entry for each. A duplicate
+\fBNAME\fP will silently overwrite any previous value.
+.IP \(bu 4
+\fB\fCupstream\fR [\fBADDRESS\fP...] resolve the \fB\fCCNAME\fR target produced by this plugin.  CoreDNS
+will resolve External Services against itself.
+
+
+.SH EXAMPLES
+.PP
+Here we handle all service requests in the \fB\fCprod\fR and \fB\fCstage\fR federations.
+
+.PP
+.RS
+
+.nf
+\&. {
+    kubernetes cluster.local
+    federation cluster.local {
+        prod prod.feddomain.com
+        staging staging.feddomain.com
         upstream
     }
 }
-.
-.fi
-.
-.IP "" 0
-.
-.P
-Or slightly shorter:
-.
-.IP "" 4
-.
-.nf
 
-cluster\.local {
+.fi
+.RE
+
+.PP
+Or slightly shorter:
+
+.PP
+.RS
+
+.nf
+cluster.local {
     kubernetes
     federation {
-        prod prod\.feddomain\.com
-        staging staging\.feddomain\.com
+        prod prod.feddomain.com
+        staging staging.feddomain.com
         upstream
     }
 }
-.
-.fi
-.
-.IP "" 0
+
+.fi
+.RE