Update official-typings-bugs.md

fix typo

Author: cw1997

docs/basic/troubleshooting/official-typings-bugs.md

@@ -36,7 +36,7 @@ const f = (e: PlotlyHTMLElement) => {
 };
 ```
 
-You dont always have to implement the module, you can simply import the module as `any` for a quick start:
+You don't always have to implement the module, you can simply import the module as `any` for a quick start:
 
 ```tsx
 // my-typings.ts