Update modules/ROOT/partials/docker/hyperlinking-service/hyperlinking-service-installation.adoc

Co-authored-by: Karl Kemister-Sheppard <[email protected]>

Author: soritaheng

modules/ROOT/partials/docker/hyperlinking-service/hyperlinking-service-installation.adoc

@@ -67,7 +67,7 @@ The following settings for the premium server-side components are optional and w
 * link:https://www.tiny.cloud/docs/tinymce/latest/configure-common-settings-services/#proxy[proxy configuration]
 * link:https://www.tiny.cloud/docs/tinymce/latest/configure-common-settings-services/#http[http configuration]
 
-The following settings for the Hyperlinking premium server-side component are optional:
+The following settings for the Hyperlinking premium server-side component are _optional_:
 
 * link:https://www.tiny.cloud/docs/tinymce/latest/configure-hyperlink-service/#link-checking[link-checking configuration]
 * link:https://www.tiny.cloud/docs/tinymce/latest/configure-hyperlink-service/#cache[cache configuration]