Fix typo in typelimits.jl (#40090)

occurence -> occurrence

Author: Ikko Ashimine

base/compiler/typelimits.jl

@@ -21,7 +21,7 @@ function limit_type_size(@nospecialize(t), @nospecialize(compare), @nospecialize
     type_more_complex(t, compare, source, 1, allowed_tupledepth, allowed_tuplelen) || return t
     r = _limit_type_size(t, compare, source, 1, allowed_tuplelen)
     #@assert t <: r # this may fail if t contains a typevar in invariant and multiple times
-        # in covariant position and r looses the occurence in invariant position (see #36407)
+        # in covariant position and r looses the occurrence in invariant position (see #36407)
     if !(t <: r) # ideally, this should never happen
         # widen to minimum complexity to obtain a valid result
         r = _limit_type_size(t, Any, source, 1, allowed_tuplelen)