chore: optimized imports and typo fix (#606)

Author: Roiocam

core/src/main/scala/com/lightbend/paradox/markdown/Directive.scala

@@ -16,7 +16,7 @@
 
 package com.lightbend.paradox.markdown
 
-import com.lightbend.paradox.tree.Tree.{Forest, Location}
+import com.lightbend.paradox.tree.Tree.Location
 import java.io.{File, FileNotFoundException}
 import java.util.Optional
 

core/src/main/scala/com/lightbend/paradox/template/PageTemplate.scala

@@ -23,8 +23,6 @@ import java.util.{Map => JMap}
 import org.stringtemplate.v4.misc.STMessage
 import org.stringtemplate.v4.{NoIndentWriter, ST, STErrorListener, STRawGroupDir}
 
-import collection.concurrent.TrieMap
-
 /**
  * Page template writer.
  */

docs/src/main/paradox/groups.md

@@ -133,5 +133,5 @@ window.groupChanged(function(group, supergroup, catalog) {
 ## Linking
 
 The current group is typically determined by the order in which is was defined, or the previously-selected
-group as stored in a cookie. It is also possible to specify the desired group as a query paramter,
+group as stored in a cookie. It is also possible to specify the desired group as a query parameter,
 so you can link to [this page with Java selected](?language=java) or [this page with Scala selected](?language=scala).