fix some typos (doc)

src/contours.rs

@@ -8,7 +8,7 @@ use std::collections::VecDeque;
 /// Whether a border of a foreground region borders an enclosing background region or a contained background region.
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub enum BorderType {
-    /// A border between a foreground region and the backround region enclosing it.
+    /// A border between a foreground region and the background region enclosing it.
     /// All points in the border lie within the foreground region.
     Outer,
     /// A border between a foreground region and a background region contained within it.

src/filter/mod.rs

@@ -937,7 +937,7 @@ mod tests {
     }
 
     /// Baseline implementation of Gaussian blur is that provided by image::imageops.
-    /// We can also use this to validate correctnes of any implementations we add here.
+    /// We can also use this to validate correctness of any implementations we add here.
     fn gaussian_baseline_rgb<I>(image: &I, stdev: f32) -> Image<Rgb<u8>>
     where
         I: GenericImage<Pixel = Rgb<u8>>,

src/region_labelling.rs

@@ -274,7 +274,7 @@ mod tests {
     }
 
     // One huge component with eight-way connectivity, loads of
-    // isolated components with four-way conectivity.
+    // isolated components with four-way connectivity.
     fn chessboard(width: u32, height: u32) -> GrayImage {
         ImageBuffer::from_fn(width, height, |x, y| {
             if (x + y) % 2 == 0 {

src/stats.rs

@@ -116,7 +116,7 @@ where
 }
 
 /// Returns the peak signal to noise ratio for a clean image and its noisy
-/// aproximation. All channels are considered equally. If you do not want this
+/// approximation. All channels are considered equally. If you do not want this
 /// (e.g. if using RGBA) then change image formats first.
 /// See also [peak signal-to-noise ratio (wikipedia)](https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio).
 pub fn peak_signal_to_noise_ratio<I, J, P>(original: &I, noisy: &J) -> f64

src/utils.rs

@@ -332,7 +332,7 @@ where
 }
 
 /// Human readable description of some of the pixels that differ
-/// signifcantly (according to provided function) between left
+/// significantly (according to provided function) between left
 /// and right, or None if all pixels match.
 pub fn significant_pixel_diff_summary<I, J, F, P>(
     actual: &I,