chore: Apply cargo fmt formatting

- Align struct field comments
- Remove extra blank line in style.rs

Author: Indosaram

examples/text_box_document.rs

@@ -61,7 +61,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         CustomTextBoxStyle {
             alignment: TextBoxAlignment::Center,
             border_style: TextBoxBorderStyle::Dashed,
-            border_color: 0x0000FF, // blue border
+            border_color: 0x0000FF,     // blue border
             background_color: 0xE6F3FF, // light blue background
         },
     )?;
@@ -75,7 +75,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         CustomTextBoxStyle {
             alignment: TextBoxAlignment::Left,
             border_style: TextBoxBorderStyle::Solid,
-            border_color: 0x00AA00, // green border
+            border_color: 0x00AA00,     // green border
             background_color: 0xE6FFE6, // light green background
         },
     )?;

src/writer/style.rs

@@ -310,7 +310,6 @@ pub enum BorderLineType {
     Thick = 5,
 }
 
-
 impl Default for BorderLineStyle {
     fn default() -> Self {
         Self {

tests/text_box_test.rs

@@ -134,7 +134,7 @@ fn test_custom_text_box() {
             CustomTextBoxStyle {
                 alignment: TextBoxAlignment::Center,
                 border_style: TextBoxBorderStyle::Dashed,
-                border_color: 0x0000FF, // blue border
+                border_color: 0x0000FF,     // blue border
                 background_color: 0xF0F0F0, // light gray background
             },
         )
@@ -259,7 +259,7 @@ fn test_multiple_text_boxes() {
             CustomTextBoxStyle {
                 alignment: TextBoxAlignment::Right,
                 border_style: TextBoxBorderStyle::Double,
-                border_color: 0x800080, // purple
+                border_color: 0x800080,     // purple
                 background_color: 0xFFE0FF, // light purple
             },
         )