fix(docs): Function calls regex example (#2306)

This fixes a wrong example of usage of the "regexmatch" function in the function call documentation.
According to https://blacksmithgu.github.io/obsidian-dataview/reference/expressions/ the usage should be regexmatch(regex, str)

docs/docs/reference/expressions.md

@@ -175,7 +175,7 @@ TABLE id, episode_metadata.next, aliases[0]
 
 Dataview supports various functions for manipulating data, which are described in full in the [functions
 documentation](../functions). They have the general syntax `function(arg1, arg2, ...)` - i.e., `lower(file.name)` or
-`regexmatch(file.folder, "A.+")`.
+`regexmatch("A.+", file.folder)`.
 
 ~~~
 ```dataview