Fix broken links in doc (#23324)

docs/4.0/content/images.md

@@ -38,7 +38,7 @@ In addition to our [border-radius utilities]({{ site.baseurl }}/docs/{{ site.doc
 
 ## Aligning images
 
-Align images with the [helper float classes]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/utilities/float) or [text alignment classes]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/text/#text-alignment). `block`-level images can be centered using [the `.mx-auto` margin utility class]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/spacing/#horizontal-centering).
+Align images with the [helper float classes]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/float) or [text alignment classes]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/text/#text-alignment). `block`-level images can be centered using [the `.mx-auto` margin utility class]({{ site.baseurl }}/docs/{{ site.docs_version }}/utilities/spacing/#horizontal-centering).
 
 <div class="bd-example bd-example-images">
   <img data-src="holder.js/200x200" class="rounded float-left" alt="A generic square placeholder image with rounded corners">

docs/4.0/getting-started/options.md

@@ -27,7 +27,7 @@ You can find and customize these variables for key global options in our `_varia
 
 | Variable                    | Values                             | Description                                                                            |
 | --------------------------- | ---------------------------------- | -------------------------------------------------------------------------------------- |
-| `$spacer`                   | `1rem` (default), or any value > 0 | Specifies the default spacer value to programmatically generate our [spacer utilities](/utilities/spacing/). |
+| `$spacer`                   | `1rem` (default), or any value > 0 | Specifies the default spacer value to programmatically generate our [spacer utilities]({{ site.baseurl }}/docs/{{ site.docs_version }}/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-gradients`         | `true` or `false` (default)        | Enables predefined gradients via `background-image` styles on various components.      |

docs/4.0/migration.md

@@ -49,7 +49,7 @@ Here are the big ticket items you'll want to be aware of when moving from v3 to
 
 ### Components
 
-- **Dropped panels, thumbnails, and wells** for a new all-encompassing component, [cards]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/cards/).
+- **Dropped panels, thumbnails, and wells** for a new all-encompassing component, [cards]({{ site.baseurl }}/docs/{{ site.docs_version }}/components/card/).
 - **Dropped the Glyphicons icon font.** If you need icons, some options are:
   - the upstream version of [Glyphicons](https://glyphicons.com/)
   - [Octicons](https://octicons.github.com/)