Fix compat docstring (#33813)

Author: tkf

base/operators.jl

@@ -834,7 +834,7 @@ Function composition also works in prefix form: `∘(f, g)` is the same as `f 
 The prefix form supports composition of multiple functions: `∘(f, g, h) = f ∘ g ∘ h`
 and splatting `∘(fs...)` for composing an iterable collection of functions.
 
-!!!compat "Julia 1.4"
+!!! compat "Julia 1.4"
     Multiple function composition requires at least Julia 1.4.
 
 # Examples