Final grammar fixes

palette/src/relative_contrast.rs

@@ -12,9 +12,9 @@ use {from_f64, FromF64};
 /// These criteria are recommendations, not hard and fast rules. Most
 /// importantly, look at the colors in action and make sure they're clear and
 /// comfortable to read. A pair of colors may pass contrast guidelines but still
-/// be uncomfortable to look. Favor readability over only satisfying the
+/// be uncomfortable to look at. Favor readability over only satisfying the
 /// contrast ratio metric. It is recommended to verify the contrast ratio
-/// in the output format of the colors, and not to assume the contrast ratio
+/// in the output format of the colors and not to assume the contrast ratio
 /// remains exactly the same across color formats. The following example checks
 /// the contrast ratio of two colors in RGB format.
 ///
@@ -41,7 +41,7 @@ use {from_f64, FromF64};
 /// contrast" such as user interface components and other graphics. The relative
 /// contrast is calculated by `(L1 + 0.05) / (L2 + 0.05)`, where `L1` is the
 /// luminance of the brighter color and `L2` is the luminance of the darker
-/// color both in sRGB linear space. Higher contrast ratio is generally
+/// color both in sRGB linear space. A higher contrast ratio is generally
 /// desireable.
 ///
 /// For more details, visit the following links: