fix: Remove export statement from index.ts (#578)

* fix: Remove export statement from index.ts

Otherwise TSC strips the closing region tag.

* fix: removes export statement

Another pesky holdover from the old repo. Now this is documented in the internal instructions.

Author: willum070

samples/advanced-markers-html-simple/index.ts

@@ -30,4 +30,3 @@ async function initMap() {
 // [END maps_advanced_markers_html_simple_snippet]
 initMap();
 // [END maps_advanced_markers_html_simple]
-export { };

samples/advanced-markers-html/index.ts

@@ -201,4 +201,3 @@ const properties = [{
 
 initMap();
 // [END maps_advanced_markers_html]
-export { };