docs: minor revisions in wording (#2170)

Author: SethFalco

docs/02-usage/index.mdx

@@ -1,6 +1,5 @@
 ---
 title: Usage
-slug: 'usage'
 ---
 
 We officially support four interfaces for SVGO:

docs/04-plugins/inlineStyles.mdx

@@ -16,4 +16,4 @@ svgo:
       description: What pseudo-classes and pseudo-elements to use. An empty string signifies all non-pseudo-classes and non-pseudo-elements.
 ---
 
-Merges styles from `<style>` elements to the `style` attribute of matching elements.
+Merge and inline CSS declarations from a `<style>` element to the `style` attribute of selected elements.

docs/04-plugins/removeUnknownsAndDefaults.mdx

@@ -5,7 +5,7 @@ svgo:
   defaultPlugin: true
   parameters:
     unknownContent:
-      description: If to remove elements that are not known or can't be the child of the parent element according.
+      description: If to remove elements that are not known or can't be the child of its parent element.
       default: true
     unknownAttrs:
       description: If to remove attributes that are not assignable to the respective element.
@@ -20,7 +20,7 @@ svgo:
       description: If to remove attributes that are being if the same value is being inherited by it's parent element anyway.
       default: true
     keepDataAttrs:
-      description: If to keep [`data-*`](https://developer.mozilla.org/docs/Web/SVG/Attribute/data-*) attributes.
+      description: If to keep [`data-*`](https://developer.mozilla.org/docs/Web/SVG/Attribute/data-*) attributes. Set to `false` to remove data attributes.
       default: true
     keepAriaAttrs:
       description: If to keep [ARIA (Accessible Rich Internet Applications)](https://developer.mozilla.org/docs/Web/Accessibility/ARIA) attributes, used for accessibility. This excludes `role`, which is managed with the `keepRoleAttr` parameter.