Clarify the $enable-shadows option in our docs (#32685)

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

site/content/docs/5.0/customize/options.md

@@ -14,7 +14,7 @@ You can find and customize these variables for key global options in Bootstrap's
 | ------------------------------ | ---------------------------------- | -------------------------------------------------------------------------------------- |
 | `$spacer`                      | `1rem` (default), or any value > 0 | Specifies the default spacer value to programmatically generate our [spacer utilities]({{< docsref "/utilities/spacing" >}}). |
 | `$enable-rounded`              | `true` (default) or `false`        | Enables predefined `border-radius` styles on various components. |
-| `$enable-shadows`              | `true` or `false` (default)        | Enables predefined `box-shadow` styles on various components. |
+| `$enable-shadows`              | `true` or `false` (default)        | Enables predefined decorative `box-shadow` styles on various components. Does not affect `box-shadow`s used for focus states. |
 | `$enable-gradients`            | `true` or `false` (default)        | Enables predefined gradients via `background-image` styles on various components. |
 | `$enable-transitions`          | `true` (default) or `false`        | Enables predefined `transition`s on various components. |
 | `$enable-reduced-motion`       | `true` (default) or `false`        | Enables the [`prefers-reduced-motion` media query]({{< docsref "/getting-started/accessibility#reduced-motion" >}}), which suppresses certain animations/transitions based on the users' browser/operating system preferences. |