squash! examples : add README.md to tts example [no ci]

Fix spelling mistake.

Author: danbev

examples/tts/README.md

@@ -1,5 +1,5 @@
 # llama.cpp/example/tts
-This example demonstrates the Text To Speach feature. It uses a
+This example demonstrates the Text To Speech feature. It uses a
 [model](https://www.outeai.com/blog/outetts-0.2-500m) from
 [outeai](https://www.outeai.com/).