Upgrade Dokka to 1.6.10 and fix docs (#351)

* Upgrade Dokka to 1.6.10

* Fix docs

Author: ilopmar

build.gradle

@@ -10,6 +10,10 @@ buildscript {
     }
 }
 
+repositories {
+    mavenCentral()
+}
+
 subprojects { Project subproject ->
     group "io.micronaut.kotlin"
 

gradle.properties

@@ -9,7 +9,7 @@ spockVersion=2.0-groovy-3.0
 
 kotlinVersion=1.6.10
 ktorVersion=1.6.1
-dokka_version=1.4.32
+dokka_version=1.6.10
 junitVersion=5.7.1
 
 title=Micronaut Kotlin Integrations

src/main/docs/guide/extensionFunctions.adoc

@@ -11,17 +11,17 @@ Thus, through defining a reified extension function to something like `BlockingH
 .Example HttpClient Extensions
 [source,kotlin]
 ----
-include::kotlin-extension-functions/src/main/kotlin/io/micronaut/http/HttpClientExtensions.kt[tags=clientFunctionSingle]
+include::kotlin-extension-functions/src/main/kotlin/io/micronaut/kotlin/http/HttpClientExtensions.kt[tags=clientFunctionSingle]
 
-include::kotlin-extension-functions/src/main/kotlin/io/micronaut/http/HttpClientExtensions.kt[tags=clientFunctionList]
+include::kotlin-extension-functions/src/main/kotlin/io/micronaut/kotlin/http/HttpClientExtensions.kt[tags=clientFunctionList]
 ----
 
 We are able to use the client a little more succinctly, as shown in this test:
 
 .Test Demonstrating Client Extension usage
 [source,kotlin]
 ----
-include::kotlin-extension-functions/src/test/kotlin/io/micronaut/http/HttpClientExtensionsTest.kt[tags=usingClientFunctions, indent="0"]
+include::kotlin-extension-functions/src/test/kotlin/io/micronaut/kotlin/http/HttpClientExtensionsTest.kt[tags=usingClientFunctions, indent="0"]
 ----
 
 As another example, you can use a generic `startApplication<AppClass>` with a configuration lambda and generic `mapError<ExceptionClass>`, as you would might use `Micronaut.build().mainClass(App::class.java).start()`.