change severity of G-2210 to critical

because using number instead of pls_integer can lead
to more resource usage (memory)

Author: PhilippSalvisberg

docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2210.md

@@ -1,6 +1,6 @@
 # G-2210: Avoid declaring NUMBER variables, constants or subtypes with no precision.
 
-!!! warning "Major"
+!!! danger "Critical"
     Efficiency
 
 ## Reason