Fixed incorrect intent of the variable "conflict" on hashmaps in document

[Daisuke897]

In the source code, the intent of the variable "conflict" in the procedure "map_entry" is "out", whereas in the documentation it is "in".
I corrected it from "in" to "out" on the documentation.

stdlib/src/stdlib_hashmaps.f90

Lines 417 to 431 in 82f35a5

	module subroutine map_chain_entry(map, key, other, conflict)
	!
	! Inserts an entry innto the hash map
	! Arguments:
	!! map - the hash table of interest
	!! key - the key identifying the entry
	!! other - other data associated with the key
	!! conflict - logical flag indicating whether the entry key conflicts
	!! with an existing key
	!
	class(chaining_hashmap_type), intent(inout) :: map
	type(key_type), intent(in) :: key
	type(other_type), intent(in), optional :: other
	logical, intent(out), optional :: conflict
	end subroutine map_chain_entry

[jvdp1]

Good catch! Thank you @Daisuke897 for this fix.