Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/blackfin/lib/ins.S b/arch/blackfin/lib/ins.S
index 3edbd8d..79cacce 100644
--- a/arch/blackfin/lib/ins.S
+++ b/arch/blackfin/lib/ins.S
@@ -67,7 +67,7 @@
  *  - DMA version, which do not suffer from this issue. DMA versions have
  *      different name (prefixed by dma_ ), and are located in
  *      ../kernel/bfin_dma_5xx.c
- * Using the dma related functions are recommended for transfering large
+ * Using the dma related functions are recommended for transferring large
  * buffers in/out of FIFOs.
  */