Update renderers for handling multi-line comments:

In asciidoc, add hard line breaks (+) only for non-empty lines.
In markdown, add only one hard line break (</br>).

renderer/asciidoctor.go

@@ -152,11 +152,14 @@ func (adr *AsciidoctorRenderer) RenderFieldDoc(text string) string {
 	lines := strings.Split(out, "\n")
 	for i := range lines {
 		lines[i] = strings.TrimSpace(lines[i])
+		// Replace newlines with hard line breaks so that newlines are rendered as expected for non-empty lines.
+		// See: https://docs.asciidoctor.org/asciidoc/latest/blocks/hard-line-breaks
+		if lines[i] != "" {
+			lines[i] = lines[i] + " +"
+		}
 	}
 
-	// Replace newlines with hard line breaks so that newlines are rendered as expected.
-	// See: https://docs.asciidoctor.org/asciidoc/latest/blocks/hard-line-breaks
-	return strings.Join(lines, " +\n\n")
+	return strings.Join(lines, "\n")
 }
 
 func (adr *AsciidoctorRenderer) RenderValidation(text string) string {

renderer/markdown.go

@@ -148,8 +148,8 @@ func (m *MarkdownRenderer) RenderFieldDoc(text string) string {
 	// so that including | in a comment does not result in wonky tables.
 	out := strings.ReplaceAll(text, "|", "\\|")
 
-	// Replace newlines with 2 line breaks so that they don't break the Markdown table formatting.
-	return strings.ReplaceAll(out, "\n", "<br /><br />")
+	// Replace newlines with 1 line break so that they don't break the Markdown table formatting.
+	return strings.ReplaceAll(out, "\n", "<br />")
 }
 
 func (m *MarkdownRenderer) RenderDefault(text string) string {