Update examples

src/writers/graphics_640x480x16.rs

@@ -16,7 +16,7 @@ static PLANES: &[Plane] = &[Plane::Plane0, Plane::Plane1, Plane::Plane2, Plane::
 /// Basic usage:
 ///
 /// ```no_run
-/// use vga::Graphics640x480x16;
+/// use vga::writers::Graphics640x480x16;
 ///
 /// let graphics_mode = Graphics640x480x16::new();
 ///

src/writers/text_40x25.rs

@@ -22,7 +22,7 @@ static BLANK_CHARACTER: ScreenCharacter = ScreenCharacter {
 /// Basic usage:
 ///
 /// ```no_run
-/// use vga::Text40x25;
+/// use vga::writers::Text40x25;
 ///
 /// let text_mode = Text40x25::new();
 ///

src/writers/text_40x50.rs

@@ -22,7 +22,7 @@ static BLANK_CHARACTER: ScreenCharacter = ScreenCharacter {
 /// Basic usage:
 ///
 /// ```no_run
-/// use vga::Text40x50;
+/// use vga::writers::Text40x50;
 ///
 /// let text_mode = Text40x50::new();
 ///

src/writers/text_80x25.rs

@@ -22,7 +22,7 @@ static BLANK_CHARACTER: ScreenCharacter = ScreenCharacter {
 /// Basic usage:
 ///
 /// ```no_run
-/// use vga::Text80x25;
+/// use vga::writers::Text80x25;
 ///
 /// let text_mode = Text80x25::new();
 ///