Add 3 missing backticks in feature descriptions

features/css-modules.yml

@@ -1,3 +1,3 @@
 name: CSS import attributes
-description: 'Module `import … with { type: "css" } statements load CSS modules as constructable stylesheets. Also known as CSS module scripts.'
+description: 'Module `import … with { type: "css" }` statements load CSS modules as constructable stylesheets. Also known as CSS module scripts.'
 spec: https://html.spec.whatwg.org/multipage/webappapis.html#css-module-script

features/nth-of-type.yml

@@ -1,5 +1,5 @@
 name: ":nth-of-type() pseudo-classes"
-description: "The `:nth-of-type()` and `:nth-last-of-type()` CSS functional pseudo-classes match elements based on their position among siblings of the same type. The `:first-of-type`, `:last-of-type`, and :only-of-type` pseudo-classes match the first, last, and only elements of its type."
+description: "The `:nth-of-type()` and `:nth-last-of-type()` CSS functional pseudo-classes match elements based on their position among siblings of the same type. The `:first-of-type`, `:last-of-type`, and `:only-of-type` pseudo-classes match the first, last, and only elements of its type."
 spec: https://drafts.csswg.org/selectors-4/#typed-child-index
 group: selectors
 compat_features:

features/rgb.yml

@@ -1,5 +1,5 @@
 name: RGB
-description: The `rgb()`, rgba()`, and hexadecimal (as in `#004488ff`) notations pick colors using red, green, blue, and alpha (transparency) channels.
+description: The `rgb()`, `rgba()`, and hexadecimal (as in `#004488ff`) notations pick colors using red, green, blue, and alpha (transparency) channels.
 spec: https://drafts.csswg.org/css-color-4/#rgb-functions
 group: color-types
 status: