refactor: format variables according to standards

boolean.go

@@ -1,8 +1,13 @@
 package sitemap
 
+// sitemap formatting with syntactic sugar. © Arthur Mingard 2022
+
+// BoolStr is a string representation of a boolean.
 type BoolStr string
 
 const (
+	// Yes is a truthy string representation.
 	Yes BoolStr = "yes"
-	No  BoolStr = "no"
+	// No is a falsy string representation.
+	No BoolStr = "no"
 )

example_xml_test.go

@@ -1,5 +1,7 @@
 package sitemap
 
+// sitemap formatting with syntactic sugar. © Arthur Mingard 2022
+
 import "fmt"
 
 func ExampleNew() {
@@ -10,15 +12,15 @@ func ExampleNew() {
 	// Output: <?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"></urlset>
 }
 
-func ExampleSitemapXML_OutputString() {
+func ExampleXML_OutputString() {
 	xml := New()
 
 	out, _ := xml.OutputString()
 	fmt.Println(out)
 	// Output: <?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"></urlset>
 }
 
-func ExampleSitemapXML_OutputPrettyString() {
+func ExampleXML_OutputPrettyString() {
 	xml := New()
 
 	out, _ := xml.OutputPrettyString("", "  ")

image.go

@@ -1,5 +1,6 @@
 package sitemap
 
+// sitemap formatting with syntactic sugar. © Arthur Mingard 2022
 // See https://developers.google.com/search/docs/crawling-indexing/sitemaps/image-sitemaps
 
 import (