Fix Liberica NIK version in the refdoc

Author: sdeleuze

spring-native-docs/src/main/asciidoc/attributes.adoc

@@ -21,6 +21,7 @@
 :github-prs: https://github.com/{github-repo}/pulls
 
 :graalvm-version: 22.1.0
+:liberica-nik-version: 22.1
 :graalvm-docs: https://www.graalvm.org/reference-manual
 :graalvm-native-docs: {graalvm-docs}/native-image
 :graalvm-native-buildtools: https://github.com/graalvm/native-build-tools

spring-native-docs/src/main/asciidoc/getting-started-native-build-tools.adoc

@@ -20,8 +20,8 @@ There are various distributions of the `native-image` compiler available, here w
 To install the native image compiler on MacOS or Linux, we recommend using https://sdkman.io/[SDKMAN]:
 
 * https://sdkman.io/install[Install SDKMAN].
-* Install a GraalVM native-image distribution, either GraalVM CE (`grl` suffix) or Bellsoft Liberica NIK (`nik` suffix), here we go with Liberica NIK Java 11 variant: `sdk install java {graalvm-version}.r11-nik`
-* Make sure to use the newly installed JDK with `sdk use java {graalvm-version}.r11-nik`
+* Install a GraalVM native-image distribution, either GraalVM CE (`grl` suffix) or Bellsoft Liberica NIK (`nik` suffix), here we go with Liberica NIK Java 11 variant: `sdk install java {liberica-nik-version}.r11-nik`
+* Make sure to use the newly installed JDK with `sdk use java {liberica-nik-version}.r11-nik`
 * Run `gu install native-image` to bring in the native-image extensions to the JDK.
 
 Alternatively, you can manually install builds from https://www.graalvm.org/downloads/[GraalVM] or https://bell-sw.com/pages/downloads/native-image-kit/[Liberica NIK]. Don't forget to set `JAVA_HOME` / `PATH` appropriately if needed and to run `gu install native-image` to bring in the native-image extensions.