fix packaging and imports

_overviews/scala3-book/packaging-imports.md

@@ -47,10 +47,11 @@ The syntax shown above applies to the entire source file: all the definitions in
 at the beginning of the file.
 
 Alternatively, it is possible to write package clauses that apply only to the definitions
-they contain: 
+they contain:
 
-{% tabs packaging-imports-1 class=tabs-scala-version %}
-{% tab 'Scala 2' %}```scala
+{% tabs packaging-imports-0 class=tabs-scala-version %}
+{% tab 'Scala 2' %}
+```scala
 package users {
 
   package administrators {  // the full name of this package is users.administrators
@@ -63,7 +64,7 @@ package users {
 ```
 
 {% endtab %}
-{% tab 'Scala 3' for=packaging-imports-1 %}
+{% tab 'Scala 3' %}
 
 ```scala
 package users:
@@ -462,7 +463,7 @@ The basic form is shown in this example:
 ```scala
 object A:
   class TC
-  given tc as TC
+  given tc: TC
   def f(using TC) = ???
 
 object B:
@@ -527,10 +528,10 @@ For example, when you have this `object`:
 {% tab 'Scala 3 only' %}
 ```scala
 object Instances:
-  given intOrd as Ordering[Int]
-  given listOrd[T: Ordering] as Ordering[List[T]]
-  given ec as ExecutionContext = ...
-  given im as Monoid[Int]
+  given intOrd: Ordering[Int]
+  given listOrd[T: Ordering]: Ordering[List[T]]
+  given ec: ExecutionContext = ...
+  given im: Monoid[Int]
 ```
 {% endtab %}
 {% endtabs %}
@@ -570,14 +571,14 @@ object MonthConversions:
     def convert(a: A): String
 
   given intMonthConverter: MonthConverter[Int] with
-    def convert(i: Int): String = 
+    def convert(i: Int): String =
       i match
         case 1 =>  "January"
         case 2 =>  "February"
         // more cases here ...
 
   given stringMonthConverter: MonthConverter[String] with
-    def convert(s: String): String = 
+    def convert(s: String): String =
       s match
         case "jan" => "January"
         case "feb" => "February"