Replace "defines" with "sets" in descriptions (#1535)

https://github.com/web-platform-dx/web-features/blob/main/docs/README.md#defines

Co-authored-by: Daniel D. Beck <[email protected]>

features/color-function.yml

@@ -1,5 +1,5 @@
 name: color()
-description: "The `color()` function defines a color within a given color space. Wide gamut color spaces like `display-p3` allow showing more vibrant and saturated colors than the standard `srgb` color space."
+description: "The `color()` function picks a color from a given color space. Wide gamut color spaces like `display-p3` allow showing more vibrant and saturated colors than the standard `srgb` color space."
 spec: https://drafts.csswg.org/css-color-4/#color-function
 caniuse: css-color-function
 group: color-types

features/counter-style.yml

@@ -1,5 +1,5 @@
 name: "@counter-style"
-description: The `@counter-style` CSS at-rule defines custom counter styles for list items. For example, you can use a sequence of specific symbols instead of numbers for an ordered list.
+description: The `@counter-style` CSS at-rule sets custom counter styles for list items. For example, you can use a sequence of specific symbols instead of numbers for an ordered list.
 spec: https://drafts.csswg.org/css-counter-styles-3/
 caniuse: css-at-counter-style
 status:

features/datalist.yml

@@ -1,5 +1,5 @@
 name: <datalist>
-description: The `<datalist>` element defines a set of recommended values for an `<input>` element. Browsers may show a dropdown menu of all options, or matching options as the user types.
+description: The `<datalist>` element sets recommended values for an `<input>` element. Browsers may show a dropdown menu of all values or match values as the user types.
 spec: https://html.spec.whatwg.org/multipage/form-elements.html#the-datalist-element
 group: forms
 caniuse: datalist

features/starting-style.yml

@@ -1,3 +1,3 @@
 name: "@starting-style"
-description: The `@starting-style` CSS at-rule defines the starting values for properties that are transitioning when the target element's style is first updated.
+description: The `@starting-style` CSS at-rule sets the starting values for properties that are transitioning when the target element's style is first updated.
 spec: https://drafts.csswg.org/css-transitions-2/#defining-before-change-style

features/tabindex.yml

@@ -1,5 +1,5 @@
 name: tabindex
-description: The `tabindex` HTML attribute make an element focusable, and defines the element's relative ordering for sequential focus navigation.
+description: The `tabindex` HTML attribute make an element focusable, and sets the element's relative ordering for sequential focus navigation.
 spec: https://html.spec.whatwg.org/multipage/interaction.html#attr-tabindex
 group: html
 caniuse: tabindex-attr