doc: some function/vars/const/package level updates (#1558)

* doc: some function/vars/const/package level updates

Various update that stood out while reading godoc.org for CoreDNS.

* Fix some misspellings as well

core/dnsserver/address.go

@@ -73,7 +73,7 @@ func normalizeZone(str string) (zoneAddr, error) {
 	return zoneAddr{Zone: dns.Fqdn(host), Port: port, Transport: trans, IPNet: ipnet}, nil
 }
 
-// SplitProtocolHostPort - split a full formed address like "dns://[::1}:53" into parts
+// SplitProtocolHostPort splits a full formed address like "dns://[::1]:53" into parts.
 func SplitProtocolHostPort(address string) (protocol string, ip string, port string, err error) {
 	parts := strings.Split(address, "://")
 	switch len(parts) {

coremain/run.go

@@ -251,9 +251,11 @@ var (
 	buildDate        string // date -u
 	gitTag           string // git describe --exact-match HEAD 2> /dev/null
 	gitNearestTag    string // git describe --abbrev=0 --tags HEAD
-	GitCommit        string // git rev-parse HEAD
 	gitShortStat     string // git diff-index --shortstat
 	gitFilesModified string // git diff-index --name-only HEAD
+
+	// Gitcommit contains the commit where we built CoreDNS from.
+	GitCommit string
 )
 
 // flagsBlacklist removes flags with these names from our flagset.

plugin/forward/metrics.go

@@ -45,7 +45,7 @@ var (
 		Namespace: plugin.Namespace,
 		Subsystem: "forward",
 		Name:      "socket_count_total",
-		Help:      "Guage of open sockets per upstream.",
+		Help:      "Gauge of open sockets per upstream.",
 	}, []string{"to"})
 )
 

plugin/forward/setup.go

@@ -25,7 +25,7 @@ func init() {
 func setup(c *caddy.Controller) error {
 	f, err := parseForward(c)
 	if err != nil {
-		return plugin.Error("foward", err)
+		return plugin.Error("forward", err)
 	}
 	if f.Len() > max {
 		return plugin.Error("forward", fmt.Errorf("more than %d TOs configured: %d", max, f.Len()))

plugin/pkg/fuzz/do.go

+// Package fuzz contains functions that enable fuzzing of plugins.
 package fuzz
 
 import (

plugin/pkg/parse/parse.go

+// Package parse contains functions that can be used in the setup code for plugins.
 package parse
 
 import (

plugin/pkg/rcode/rcode.go

@@ -6,8 +6,7 @@ import (
 	"github.com/miekg/dns"
 )
 
-// ToString convert the rcode to the official DNS string, or to "RCODE"+value if the RCODE
-// value is unknown.
+// ToString convert the rcode to the official DNS string, or to "RCODE"+value if the RCODE value is unknown.
 func ToString(rcode int) string {
 	if str, ok := dns.RcodeToString[rcode]; ok {
 		return str

plugin/pkg/up/up.go

+// Package up is used to run a function for some duration. If a new function is added while a previous run is
+// still ongoing, nothing new will be executed.
 package up
 
 import (

request/request.go

-// Package request abstracts a client's request so that all plugin
-// will handle them in an unified way.
+// Package request abstracts a client's request so that all plugins will handle them in an unified way.
 package request
 
 import (