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

mechanical change: create the manual pages.

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

man/coredns-grpc.7

@@ -1,18 +1,18 @@
 .\" Generated by Mmark Markdown Processer - mmark.nl
-.TH "COREDNS-GRPC" "7" "April 2019" "CoreDNS" "CoreDNS Plugins"
+.TH "COREDNS-GRPC" 7 "June 2019" "CoreDNS" "CoreDNS Plugins"
 
-.SH NAME
+.SH "NAME"
 .PP
 \fIgrpc\fP - facilitates proxying DNS messages to upstream resolvers via gRPC protocol.
 
-.SH DESCRIPTION
+.SH "DESCRIPTION"
 .PP
 The \fIgrpc\fP plugin supports gRPC and TLS.
 
 .PP
 This plugin can only be used once per Server Block.
 
-.SH SYNTAX
+.SH "SYNTAX"
 .PP
 In its most basic form:
 
@@ -88,7 +88,7 @@ but they have to use the same \fB\fCtls_servername\fR. E.g. mixing 9.9.9.9 (Quad
 Also note the TLS config is "global" for the whole grpc proxy if you need a different
 \fB\fCtls-name\fR for different upstreams you're out of luck.
 
-.SH METRICS
+.SH "METRICS"
 .PP
 If monitoring is enabled (via the \fIprometheus\fP directive) then the following metric are exported:
 
@@ -101,7 +101,7 @@ If monitoring is enabled (via the \fIprometheus\fP directive) then the following
 and we are randomly (this always uses the \fB\fCrandom\fR policy) spraying to an upstream.
 
 
-.SH EXAMPLES
+.SH "EXAMPLES"
 .PP
 Proxy all requests within \fB\fCexample.org.\fR to a nameserver running on a different port:
 
@@ -198,7 +198,7 @@ Or with multiple upstreams from the same provider
 .fi
 .RE
 
-.SH BUGS
+.SH "BUGS"
 .PP
 The TLS config is global for the whole grpc proxy if you need a different \fB\fCtls_servername\fR for
 different upstreams you're out of luck.