fix typos in "Understanding Colors and Luminance" (mdn#33498)

fix typos

files/en-us/web/accessibility/understanding_colors_and_luminance/index.md

@@ -121,15 +121,15 @@ In addition to developer tools, many tools can convert RGB to HSL for you and pr
 
 ![Color picker with HSL and RGB, with color contrast values.](microcolorsc.jpg)
 
-As noted earlier, the [CSS color module](/en-US/docs/Web/CSS/CSS_colors) includes adding additional colorspaces, including [`lch()`](/en-US/docs/Web/CSS/color_value/lch) and [`oklch()`](/en-US/docs/Web/CSS/color_value/oklch) functional color notation and the [`lab()`](/en-US/docs/Web/CSS/color_value/lab) and `oklab()`](/en-US/docs/Web/CSS/color_value/oklab) color coordinate systems, which can specify any visible color. That said, sRGB is still the default and preferred colorspace for accessibility because of its ubiquity.
+As noted earlier, the [CSS color module](/en-US/docs/Web/CSS/CSS_colors) includes adding additional colorspaces, including [`lch()`](/en-US/docs/Web/CSS/color_value/lch) and [`oklch()`](/en-US/docs/Web/CSS/color_value/oklch) functional color notation and the [`lab()`](/en-US/docs/Web/CSS/color_value/lab) and [`oklab()`](/en-US/docs/Web/CSS/color_value/oklab) color coordinate systems, which can specify any visible color. That said, sRGB is still the default and preferred colorspace for accessibility because of its ubiquity.
 
 Where accessibility is concerned, however, standards and guidelines are currently written predominantly using the sRGB color space, especially as it applies to color contrast ratios.
 
 > **Note:** Almost all systems used today to view Web content assume sRGB encoding. Unless it is known that another color space will be used to process and display the content, authors should evaluate using sRGB colorspace. If using other color spaces, apply the principles of [minimum contrast ratios](https://webaim.org/articles/contrast/#sc143).
 
 ### Querying color values
 
-The {{domxref('Window.getComputedStyle()')}} method returns values using the RGB Decimal Reference scale or via `color(srgb...)`. For example, calling `Window.getComputedStyle()` on a `<div>` with `background-color: #2550000` set on it returns the computed background color as `rgb(255 0 0)` — the RGB Decimal reference. However, when [using relative colors](/en-US/docs/Web/CSS/CSS_colors/Relative_colors) (for example `background-color: rgb(from blue 255 0 0)`), calling `Window.getComputedStyle()` returns the computed background color as `color(srgb 1 0 0)`. Being tied to computer hardware,`Window.getComputedStyle()` measures color in terms of RGB, not how the human eye perceives color.
+The {{domxref('Window.getComputedStyle()')}} method returns values using the RGB Decimal Reference scale or via `color(srgb...)`. For example, calling `Window.getComputedStyle()` on a `<div>` with `background-color: #ff0000` set on it returns the computed background color as `rgb(255 0 0)` — the RGB Decimal reference. However, when [using relative colors](/en-US/docs/Web/CSS/CSS_colors/Relative_colors) (for example `background-color: rgb(from blue 255 0 0)`), calling `Window.getComputedStyle()` returns the computed background color as `color(srgb 1 0 0)`. Being tied to computer hardware,`Window.getComputedStyle()` measures color in terms of RGB, not how the human eye perceives color.
 
 ### Red / green color blindness