doc: Fix case in titles

Unified case in titles.
Fixed small grammar issues.

Signed-off-by: Francesco Servidio <francesco.servidio@nordicsemi.no>
diff --git a/docs/readme-espressif.md b/docs/readme-espressif.md
index bd95178..e391627 100644
--- a/docs/readme-espressif.md
+++ b/docs/readme-espressif.md
@@ -14,7 +14,7 @@
     - Zephyr RTOS - _WIP_
     - NuttX - _WIP_
 
-## Installing Requirements and Dependencies
+## Installing requirements and dependencies
 
 1. Install additional packages required for development with MCUboot: