Change docx folder to more appropriate "file" folder

src/file/paragraph/formatting/index.ts

@@ -0,0 +1,9 @@
+export * from "./alignment";
+export * from "./border";
+export * from "./indent";
+export * from "./keep";
+export * from "./page-break";
+export * from "./spacing";
+export * from "./style";
+export * from "./tab-stop";
+export * from "./unordered-list";