proper doc comments

src/imgdata.rs

@@ -12,7 +12,7 @@ pub struct ThinGridData {
 }
 
 impl ThinGridData {
-    // Convert Grid to ThinGridData
+    /// Convert Grid to ThinGridData
     pub fn new_from_grid(in_grid: &Grid) -> Self {
         ThinGridData {
             width: in_grid.width,
@@ -22,13 +22,10 @@ impl ThinGridData {
     }
 
     pub fn new_from_grid_vec(in_grids: &[Grid]) -> Vec<Self> {
-        in_grids
-            .iter()
-            .map(Self::new_from_grid)
-            .collect()
+        in_grids.iter().map(Self::new_from_grid).collect()
     }
 
-    // from grid.rs (needed in image gen)
+    /// from grid.rs (needed in image gen)
     pub fn quantile(&self, fraction: f32) -> f32 {
         let index = if (fraction - 1.0_f32).abs() < f32::EPSILON {
             self.data.len() - 1