switch apm-server to asciidoctor (#1083)

Author: bmorelli25

conf.yaml

@@ -1035,6 +1035,7 @@ contents:
                 chunk:      1
                 tags:       APM Server/Reference
                 subject:    APM
+                asciidoctor: true
                 sources:
                   -
                     repo:   apm-server

doc_build_aliases.sh

@@ -105,7 +105,7 @@ alias docbldjb='$GIT_HOME/docs/build_docs --doc $GIT_HOME/beats/journalbeat/docs
 # APM
 alias docbldamg='$GIT_HOME/docs/build_docs --asciidoctor --doc $GIT_HOME/apm-server/docs/guide/index.asciidoc --chunk 1'
 
-alias docbldamr='$GIT_HOME/docs/build_docs --doc $GIT_HOME/apm-server/docs/index.asciidoc --chunk 1'
+alias docbldamr='$GIT_HOME/docs/build_docs --asciidoctor --doc $GIT_HOME/apm-server/docs/index.asciidoc --chunk 1'
 
 alias docbldamn='$GIT_HOME/docs/build_docs --asciidoctor --doc $GIT_HOME/apm-agent-nodejs/docs/index.asciidoc --chunk 1'