libs: made error message clearer and more consistent

lib/version.sh

@@ -13,7 +13,7 @@
 get_os_version()
 {
     if [[ ! -f /etc/os-release ]]; then
-        prnt E "Your distribution doesn't have the needed os-release file."
+        prnt E "get_os_version(): Your distribution doesn't have the needed os-release file."
         die 8 --force
     fi
 
@@ -26,7 +26,7 @@ get_os_version()
         source /etc/os-release
 
         if [[ -z $ID ]]; then
-            prnt E "Your /etc/os-release file mises some vital information."
+            prnt E "get_os_version(): Your /etc/os-release file mises some vital information."
             die --force 8
         fi
 
@@ -50,7 +50,7 @@ export read_os_release
 set_sys_vars()
 {
     if [[ $# -ne 4 ]]; then
-        prnt E "get_os_version(): incorect number of parameters ($@)."
+        prnt E "set_sys_vars(): Incorrect number of parameters ($@)."
         die --force 7
     fi