Standardize on speaker note markup

tools/content-archetype/src/main/resources/archetype-resources/src/main/asciidoc/index.adoc

diff --git a/tools/content-archetype/src/main/resources/archetype-resources/src/main/asciidoc/index.adoc b/tools/content-archetype/src/main/resources/archetype-resources/src/main/asciidoc/index.adoc
index 5abf891..0a1d6fd 100644
--- a/tools/content-archetype/src/main/resources/archetype-resources/src/main/asciidoc/index.adoc
+++ b/tools/content-archetype/src/main/resources/archetype-resources/src/main/asciidoc/index.adoc
@@ -38,7 +38,7 @@
 
 Press the `*s*` key to access speaker notes.
 
-[NOTE.speaker]
+[.notes]
 --
 You've unlocked the super secret notes area.
 Neat huh?
@@ -156,7 +156,7 @@
 * icon:wrench[]
 * icon:beer[role=orange]
 
-[NOTE.speaker]
+[.notes]
 --
 * Find icons here: https://fontawesome.com/v4.7.0/icons/
 * Color icons by defining css styles in apache.css and referencing them with "role"
@@ -352,7 +352,7 @@
 Person *--1 Location
 ....
 
-[NOTE.speaker]
+[.notes]
 --
 --
 
@@ -361,7 +361,7 @@
 
 mermaid::diagrams/mermaid-flowchart-test.mmd[png]
 
-[NOTE.speaker]
+[.notes]
 --
 --