Fix syntax for badge

Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

README.md

@@ -1,5 +1,4 @@
-![Documentation Build]
-(https://github.com/nrfconnect/nrf70-bm/actions/workflows/docbuild.yml/badge.svg?branch=main)
+![Documentation Build](https://github.com/nrfconnect/nrf70-bm/actions/workflows/docbuild.yml/badge.svg?branch=main)
 
 nRF70 BM Driver README
 ======================