Update links.md to add reference-style links (#1326)

* Update links.md to add reference-style links

This adds a section on reference-style links to the docs.

* Update links.md

* Update links.md

* Update links.md

* Update links.md

* Update links.md

* Update links.md

* Update docs/syntax/links.md

Co-authored-by: Visha Angelova <[email protected]>

* Update links.md

* Update docs/syntax/links.md

Co-authored-by: Martijn Laarman <[email protected]>

---------

Co-authored-by: Visha Angelova <[email protected]>
Co-authored-by: Martijn Laarman <[email protected]>

Author: 3 people

docs/syntax/links.md

@@ -1,11 +1,13 @@
 # Links
 
-A markdown link looks like this:
+A Markdown link looks like this:
 
 ```markdown
 [Link text](destination.md)
 ```
+
 It has two components:
+
 - Link **text** enclosed in square brackets `[ ]`
 - Link **destination** enclosed in parentheses `( )`
 
@@ -133,6 +135,41 @@ You can also auto-generate text for specific headings within files:
 <!-- Uses the "Configuration" section title from current file -->
 ```
 
+## Reference-style links
+
+`docs-builder` supports reference-style external links.
+
+::::{tab-set}
+
+:::{tab-item} Output
+
+- [Link]: This link uses the reference name as text.
+- [Your own text][Link]: This link overrides the reference name.
+
+% References are typically added at the bottom of the page
+
+[Link]: https://elastic.co/docs
+
+:::
+
+:::{tab-item} Markdown
+
+```markdown
+- [Link]: This link uses the reference name as text.
+- [Your own text][Link]: This link overrides the reference name.
+
+% References are typically added at the bottom of the page
+
+[Link]: https://elastic.co/docs
+```
+
+:::
+
+
+::::
+
+Reference-style links are useful when adding links to tables, for example, or to update frequently used links more easily. Place them at the end of the document to simplify their management.
+
 ## Legacy features
 
 ### Inline anchors