Clearfy the usage of String.match(expr)

[heppocogne]

Your Godot version:
Godot 3.6 & Godot 4.3

Issue description:
In the current explanation, it's unclear that which string should be wildcard pattern, i.e., whether the caller or the expr argument should be. (Same for String.matchn(expr))

"abcdef".match("a?c*")   # correct
"a?c*".match("abcdef")   # wrong

Sample code or additional explanation such as "returns true if the string matches the pattern expr" would be helpful.

URL to the documentation page:
https://docs.godotengine.org/en/stable/classes/class_string.html#class-string-method-match