Fix Scala links to previous releases

JAVA-3789

Author: rozza

docs/reference/content/driver-scala/index.md

@@ -27,10 +27,10 @@ For tutorials for some frequently used operations, see the [Tutorials section]({
 | Release | Documentation |
 |---------|---------------|
 |  4.0.2  | {{< releases version="4.0" >}} | 
-|  2.9.0  | {{< releases version="2.9.0" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
-|  2.8.0  | {{< releases version="2.8.0" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
-|  2.7.0  | {{< releases version="2.7.0" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
-|  2.6.0  | {{< releases version="2.6.0" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
-|  2.5.0  | {{< releases version="2.5.0" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
-|  2.4.2  | {{< releases version="2.4.2" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
-|  2.3.0  | {{< releases version="2.3.0" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.9.0  | {{< releases version="2.9" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.8.0  | {{< releases version="2.8" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.7.0  | {{< releases version="2.7" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.6.0  | {{< releases version="2.6" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.5.0  | {{< releases version="2.5" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.4.2  | {{< releases version="2.4" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |
+|  2.3.0  | {{< releases version="2.3" apiDir="scaladoc" url="https://mongodb.github.io/mongo-scala-driver/" >}} |

docs/reference/layouts/shortcodes/releases.html

@@ -1,5 +1,6 @@
 {{- $url := .Get "url" | default "../../" -}}
 {{- $version := .Get "version" -}}
 {{- $legacy := .Get "legacy" -}}
+{{- $apiDir := .Get "apiDir" | default "javadoc" -}}
 
-<a href="{{ $url }}{{$version}}/">Reference</a> &#124; <a href="{{  $url }}{{$version}}/javadoc/">API</a>
+<a href="{{ $url }}{{$version}}/">Reference</a> &#124; <a href="{{  $url }}{{$version}}/{{$apiDir}}/">API</a>