doc: make -f Makefile.doc (#2919)

mechanical change: create the manual pages.

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

man/coredns-whoami.7

@@ -1,11 +1,11 @@
 .\" Generated by Mmark Markdown Processer - mmark.nl
-.TH "COREDNS-WHOAMI" "7" "April 2019" "CoreDNS" "CoreDNS Plugins"
+.TH "COREDNS-WHOAMI" 7 "June 2019" "CoreDNS" "CoreDNS Plugins"
 
-.SH NAME
+.SH "NAME"
 .PP
 \fIwhoami\fP - returns your resolver's local IP address, port and transport.
 
-.SH DESCRIPTION
+.SH "DESCRIPTION"
 .PP
 The \fIwhoami\fP plugin is not really that useful, but can be used for having a simple (fast) endpoint
 to test clients against. When \fIwhoami\fP returns a response it will have your client's IP address in
@@ -32,7 +32,7 @@ If CoreDNS can't find a Corefile on startup this is the \fIdefault\fP plugin tha
 it can be used to check that CoreDNS is responding to queries. Other than that this plugin is of
 limited use in production.
 
-.SH SYNTAX
+.SH "SYNTAX"
 .PP
 .RS
 
@@ -42,7 +42,7 @@ whoami
 .fi
 .RE
 
-.SH EXAMPLES
+.SH "EXAMPLES"
 .PP
 Start a server on the default port and load the \fIwhoami\fP plugin.
 
@@ -74,7 +74,7 @@ example.org.            0       IN      A       10.240.0.1
 .fi
 .RE
 
-.SH SEE ALSO
+.SH "SEE ALSO"
 .PP
 Read the blog post
 \[la]https://coredns.io/2017/03/01/how-to-add-plugins-to-coredns/\[ra] on how this plugin is built, or explore the source code