fix unintented copy/paste

Author: ggrossetie

packages/core/types/index.d.ts

@@ -2158,7 +2158,7 @@ export namespace Asciidoctor {
 
     /**
      * Get the location in the AsciiDoc source where this block begins.
-     * @returns the style for this blockfindBy
+     * @returns the style for this block
      */
     getSourceLocation(): Cursor;