Switch order of sections in reference docs

Client and Testing after all others such as Security,
Observability, and GraalVM.

Author: rstoyanchev

spring-graphql-docs/src/docs/asciidoc/index.adoc

@@ -1665,13 +1665,23 @@ The 1.0.x branch of this repository contains samples for
 
 
 
+include::includes/observability.adoc[leveloffset=+1]
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+
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+include::includes/graalvm-native.adoc[leveloffset=+1]
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 include::includes/client.adoc[leveloffset=+1]
 
-include::includes/observability.adoc[leveloffset=+1]
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+
 
 include::includes/testing.adoc[leveloffset=+1]
 
-include::includes/graalvm-native.adoc[leveloffset=+1]