Update samples/tone_doremi/README.rst

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: soburi

samples/tone_doremi/README.rst

@@ -7,7 +7,7 @@ Overview
 ********
 
 Use tone to play the scale.
-Play Do, Re, Mi on D4 pin, then  Fa, So, La on D5 pin.
+Play Do, Re, Mi on D4 pin, then Fa, So, La on D5 pin.
 
 Building and Running
 ********************