logic of CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL doesn't match its document (IDFGH-12318)

[yyjdelete]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

The document says

if (size < threshold) //use internal RAM
else //use external RAM

but the code use <= instead, so which one is wrong and what's the expected behavior?

esp-idf/docs/en/api-guides/external-ram.rst

Lines 103 to 104 in 60a2bf6

	- When allocating a size less than the threshold, the allocator will try internal memory first.
	- When allocating a size equal to or larger than the threshold, the allocator will try external memory first.

esp-idf/components/heap/heap_caps.c

Lines 235 to 239 in 60a2bf6

	if (size <= (size_t)malloc_alwaysinternal_limit) {
	r=heap_caps_malloc_base( size, MALLOC_CAP_DEFAULT | MALLOC_CAP_INTERNAL );
	} else {
	r=heap_caps_malloc_base( size, MALLOC_CAP_DEFAULT | MALLOC_CAP_SPIRAM );
	}

[0xjakob]

@yyjdelete We've created a fix for this which will be available on master soon, thanks for noticing!