Update better-countdown.md

Author: LotharieSlayer

scripts/better-countdown/better-countdown.md

@@ -7,7 +7,7 @@
 - Text Source where minutes wiil be countdown
 - Final Text (optional, by default empty)
 
-If you have problem running this lua script, please make sure you carefully follow the instructions from the <a href="https://github.com/LotharieSlayer/OBS-scripts">README</a> file at the root of this repository.
+If you have problem running this Lua script, please make sure you carefully follow the instructions from the <a href="https://github.com/LotharieSlayer/OBS-scripts">README</a> file at the root of this repository.
 
 ### Why is it useful for me ?
 To make a great countdown with beautiful text source on my Pause scene. And because making a pause about an hour for a streamer is just unbelievable.