README.md minor improvements

Author: yaroslav957

README.md

@@ -45,7 +45,7 @@ mount "here /path_to_disk_partition" esp
 
 mkdir esp/EFI/BOOT
 
-cp efifetch.efi esp/EFI/BOOT/BOOTX64.EFI
+cp efifetch.efi esp/EFI/BOOT/BOOTX64.efi
 ```
 
 # Features info & todos
@@ -75,4 +75,4 @@ TODO:
   - PCI page = `<F4>`
   - ACPI tables page = `<F5>`
   - SMBIOS page = `<F6>`
-  - HOST page = `<F7>`
+  - HOST page = `<F7>`