qcacld-3.0: Fix misspelling of 'virtual'

Fix misspelling 'virtaul' => 'virtual'

Change-Id: I51517b1a879bae1adcbe90a75043198d9352c27b
CRs-Fixed: 2240064

core/dp/htt/htt_tx.c

@@ -473,7 +473,7 @@ int htt_tx_credit_update(struct htt_pdev_t *pdev)
 /**
  * htt_tx_get_paddr() - get physical address for htt desc
  *
- * Get HTT descriptor physical address from virtaul address
+ * Get HTT descriptor physical address from virtual address
  * Find page first and find offset
  * Not required for HL systems
  *