docs: Fix a typo in README.md

Author: tbzatek

README.md

@@ -1,7 +1,7 @@
 # libnvme
 
 This is the libnvme development C library. libnvme provides type
-defintions for NVMe specification structures, enumerations, and bit
+definitions for NVMe specification structures, enumerations, and bit
 fields, helper functions to construct, dispatch, and decode commands
 and payloads, and utilities to connect, scan, and manage nvme devices
 on a Linux system.