Fix wording, normalize capitalization (#762)

Co-authored-by: longpanda <59477474+ventoy@users.noreply.github.com>

INSTALL/tool/VentoyWorker.sh

@@ -7,7 +7,7 @@ print_usage() {
     echo 'Usage:  Ventoy2Disk.sh CMD [ OPTION ] /dev/sdX'
     echo '  CMD:'
     echo '   -i  install Ventoy to sdX (fails if disk already installed with Ventoy)'
-    echo '   -I  force install Ventoy to sdX (no matter installed or not)'
+    echo '   -I  force install Ventoy to sdX (no matter if installed or not)'
     echo '   -u  update Ventoy in sdX'
     echo '   -l  list Ventoy information in sdX'
     echo ''
@@ -165,7 +165,7 @@ if [ -d ./tmp_mnt ]; then
     umount ./tmp_mnt >/dev/null 2>&1
     rm -rf ./tmp_mnt
     if [ -d ./tmp_mnt ]; then
-        vterr "tmp_mnt directory exits, please delete it first."
+        vterr "tmp_mnt directory exists, please delete it first."
         exit 1
     fi
 fi
@@ -345,6 +345,7 @@ if [ "$MODE" = "install" -a -z "$NONDESTRUCTIVE" ]; then
     sync
 
     vtinfo "esp partition processing ..."
+
     if [ "$SECUREBOOT" != "YES" ]; then 
         sleep 2
         check_umount_disk "$DISK"  
@@ -551,7 +552,7 @@ else
     vtinfo "Upgrade operation is safe, all the data in the 1st partition (iso files and other) will be unchanged!"
     echo ""
 
-    read -p "Update Ventoy  $oldver ===> $curver   Continue? (y/n)"  Answer
+    read -p "Update Ventoy  $oldver ===> $curver   Continue? (y/n) "  Answer
     if [ "$Answer" != "y" ]; then
         if [ "$Answer" != "Y" ]; then
             exit 0