Add compat to @test_throws

closes JuliaLang#45892

stdlib/Test/src/Test.jl

@@ -682,6 +682,9 @@ a matching function,
 or a value (which will be tested for equality by comparing fields).
 Note that `@test_throws` does not support a trailing keyword form.
 
+!!! compat "Julia 1.7"
+    The ability to specify anything other than a type or a value as `exception` requires Julia v1.7 or later.
+
 # Examples
 ```jldoctest
 julia> @test_throws BoundsError [1, 2, 3][4]
@@ -701,7 +704,7 @@ In the final example, instead of matching a single string it could alternatively
 
 - `["Try", "Complex"]` (a list of strings)
 - `r"Try sqrt\\([Cc]omplex"` (a regular expression)
-- `str -> occursin("complex", str)` (a matching function)
+- `str -> occursin("complex", str)` (a matching function)                                                      
 """
 macro test_throws(extype, ex)
     orig_ex = Expr(:inert, ex)