doc: update the multiplatform installation guide

Instead of registering the KSP plugin for each target, we ask the user to configure it for the common one.

documentation/topics/getting-started.md

@@ -13,18 +13,16 @@ project structure.
 <step>
 Add KSP to your plugin list; make sure to <a href="https://github.com/google/ksp/releases">use the appropriate 
 version</a>, depending on the Kotlin version you're using.
-<br/>
 <code-block lang="kotlin">
 plugins {
-    kotlin("jvm") version "2.0.10"
-    id("com.google.devtools.ksp") version "2.0.10-1.0.24"
+    kotlin("jvm") version "2.0.20"
+    id("com.google.devtools.ksp") version "2.0.20-1.0.25"
 }
 </code-block>
 </step>
 
 <step>
 Add the dependencies and register the compiler plugin through KSP.
-<br/>
 <code-block lang="kotlin">
 dependencies {
     implementation("dev.nesk.akkurate:akkurate-core:%version%")
@@ -40,37 +38,42 @@ dependencies {
 <step>
 Add KSP to your plugin list; make sure to <a href="https://github.com/google/ksp/releases">use the appropriate 
 version</a>, depending on the Kotlin version you're using.
-<br/>
 <code-block lang="kotlin">
 plugins {
-    kotlin("multiplatform") version "2.0.10"
-    id("com.google.devtools.ksp") version "2.0.10-1.0.24"
+    kotlin("multiplatform") version "2.0.20"
+    id("com.google.devtools.ksp") version "2.0.20-1.0.25"
 }
 </code-block>
 </step>
 
 <step>
-Add the dependencies to the appropriate targets (change them to your liking).
-<br/>
+Register the compiler plugin for the common target:
 <code-block lang="kotlin">
-sourceSets {
-    jvmMain.dependencies {
-        implementation("dev.nesk.akkurate:akkurate-core:%version%")
-    }
-    jsMain.dependencies {  
-        implementation("dev.nesk.akkurate:akkurate-core:%version%")
+dependencies {
+    add("kspCommonMainMetadata", "dev.nesk.akkurate:akkurate-ksp-plugin:%version%")
+}
+tasks {
+    withType&lt;KotlinCompilationTask&lt;*&gt;&gt;().configureEach {
+        if (name != "kspCommonMainKotlinMetadata") {
+            dependsOn("kspCommonMainKotlinMetadata")
+        }
     }
 }
 </code-block>
 </step>
 
 <step>
-Register the compiler plugin for the same targets.
-<br/>
+Configure the <code>commonMain</code> source set:
 <code-block lang="kotlin">
-dependencies {
-    add("kspJvm", "dev.nesk.akkurate:akkurate-ksp-plugin:%version%")
-    add("kspJs", "dev.nesk.akkurate:akkurate-ksp-plugin:%version%")
+sourceSets {
+    commonMain {
+        dependencies {
+            // Add %product% dependencies
+            implementation("dev.nesk.akkurate:akkurate-core:%version%")
+        }
+        // Include the code generated by the KSP plugin 
+        kotlin.srcDir("build/generated/ksp/metadata/commonMain/kotlin")
+    }
 }
 </code-block>
 </step>