doc updates, and relabel ReportMethod

in the Logrus context it's the caller, so use that internally.  Label
stays as 'method' since in the context of the log event that seems more
correct.

exported.go

@@ -27,20 +27,18 @@ func SetFormatter(formatter Formatter) {
 	std.Formatter = formatter
 }
 
-// SetReportMethod sets whether to include calling method and line as
-// fields
-func SetReportMethod(include bool) {
+// SetReportCaller sets whether to include the calling method as a field
+func SetReportCaller(include bool) {
 	std.mu.Lock()
 	defer std.mu.Unlock()
-	std.ReportMethod = include
+	std.ReportCaller = include
 }
 
-// ReportMethod sets whether to include calling method and line as
-// fields
-func ReportMethod() bool {
+// ReportCaller returns the 'include calling method' state
+func ReportCaller() bool {
 	std.mu.Lock()
 	defer std.mu.Unlock()
-	return std.ReportMethod
+	return std.ReportCaller
 }
 
 // SetLevel sets the standard logger level.