Change installing munit to reflect changes in scala-cli (#2811)

* Change installing munit to reflect changes in scala-cli

* Adjust directives syntax

* script -> source

* Fix wording

* Update _includes/_markdown/install-munit.md

---------

Co-authored-by: adpi2 <adrien.piquerez@gmail.com>

Author: szymon-rd

_includes/_markdown/install-munit.md

@@ -4,12 +4,13 @@
 {% tab 'Scala CLI' %}
 You can require the entire toolkit in a single line:
 ```scala
-//> using dep "org.scala-lang::toolkit-test:0.1.7"
+//> using toolkit latest
 ```
+MUnit, being a testing framework, is only available in test files: files in a `test` directory or ones that have the `.test.scala` extension. Refer to the [Scala CLI documentation](https://scala-cli.virtuslab.org/docs/commands/test/) to learn more about the test scope.
 
 Alternatively, you can require just a specific version of MUnit:
 ```scala
-//> using dep "org.scalameta::munit:1.0.0-M7"
+//> using dep org.scalameta::munit:1.0.0-M7
 ```
 {% endtab %}
 {% tab 'sbt' %}

_includes/_markdown/install-os-lib.md

@@ -4,12 +4,12 @@
 {% tab 'Scala CLI' %}
 You can require the entire toolkit in a single line:
 ```scala
-//> using toolkit "latest"
+//> using toolkit latest
 ```
 
 Alternatively, you can require just a specific version of OS-Lib:
 ```scala
-//> using dep "com.lihaoyi::os-lib:0.9.1"
+//> using dep com.lihaoyi::os-lib:0.9.1
 ```
 {% endtab %}
 {% tab 'sbt' %}

_includes/_markdown/install-sttp.md

@@ -4,12 +4,12 @@
 {% tab 'Scala CLI' %}
 You can require the entire toolkit in a single line:
 ```scala
-//> using toolkit "latest"
+//> using toolkit latest
 ```
 
 Alternatively, you can require just a specific version of sttp:
 ```scala
-//> using dep "com.softwaremill.sttp.client4::core:4.0.0-M1"
+//> using dep com.softwaremill.sttp.client4::core:4.0.0-M1
 ```
 {% endtab %}
 {% tab 'sbt' %}

_includes/_markdown/install-upickle.md

@@ -4,12 +4,12 @@
 {% tab 'Scala CLI' %}
 Using Scala CLI, you can require the entire toolkit in a single line:
 ```scala
-//> using toolkit "latest"
+//> using toolkit latest
 ```
 
 Alternatively, you can require just a specific version of UPickle:
 ```scala
-//> using dep "com.lihaoyi::upickle:3.1.0
+//> using dep com.lihaoyi::upickle:3.1.0
 ```
 {% endtab %}
 {% tab 'sbt' %}