docs: improve the docs by provide better examples and describe module publishing (#12308)

examples/compiletime/methods.v

@@ -0,0 +1,38 @@
+struct App {}
+
+fn (mut app App) method_one() {}
+
+fn (mut app App) method_two() int {
+	return 0
+}
+
+fn (mut app App) method_three(s string) string {
+	return s
+}
+
+fn main() {
+	$for method in App.methods {
+		$if method.typ is fn (string) string {
+			println('$method.name IS `fn(string) string`')
+		} $else {
+			println('$method.name is NOT `fn(string) string`')
+		}
+		$if method.return_type !is int {
+			println('$method.name does NOT return `int`')
+		} $else {
+			println('$method.name DOES return `int`')
+		}
+		$if method.args[0].typ !is string {
+			println("$method.name's first arg is NOT `string`")
+		} $else {
+			println("$method.name's first arg IS `string`")
+		}
+		// TODO: Double inversion, should this even be allowed?
+		$if method.typ is fn () {
+			println('$method.name IS a void method')
+		} $else {
+			println('$method.name is NOT a void method')
+		}
+		println('')
+	}
+}