Misleading rendering of `$argc` and `$argv` in function bodies

[flack]

Describe the bug

As mentioned in https://github.com/eclipse-pdt/pdt/issues/120#issuecomment-1621815302 $argc and $argv are currently rendered like superglobals when they appear inside of function bodies, but in that case, they are local variables

Expected behavior $argc and $argv should be rendered as local variables when they appear in a function body (or maybe even in general, if that makes it easier)

Screenshots