Update README.md

fix typo.

Author: dzvon

src/06-hello-world/README.md

@@ -110,7 +110,7 @@ hello_world::__cortex_m_rt_main () at ~/embedded-discovery/src/06-hello-world/sr
 ```
 
 Now issue a `next` command which will exectue `aux6::init()` and
-stop at he next executable statement in `main.rs`, which
+stop at the next executable statement in `main.rs`, which
 positions us at line 12:
 
 ``` text