Fix two typos in the docs

Author: alexwlchan

README.md

@@ -46,7 +46,7 @@ repository.
 
 There is a Makefile provided that does some extra preprocessing of the source,
 which is needed only if you add new interned strings to qstrdefsport.h.  The
-Makefile also puts the resulting firmare at build/firmware.hex, and includes
+Makefile also puts the resulting firmware at build/firmware.hex, and includes
 some convenience targets.
 
 How to use

docs/index.rst

@@ -3,7 +3,7 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
-Welcome to BBC Microbit Micropython's documentation!
+Welcome to BBC Microbit MicroPython's documentation!
 ====================================================
 
 Contents: