edac, mips: don't change code that has been removed in edac/mips tree

This is a partial revert of

	15ed103a98 ("edac: Fix spelling errors")
	6997991ab0 ("mips: Fix printk typos in arc/mips")

which change code that doesn't exist any more in edac/mips trees.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/edac/edac_device.c

@@ -367,7 +367,7 @@ static void del_edac_device_from_global_list(struct edac_device_ctl_info
  *	structure, that needs to be polled for possible error events.
  *
  *	This operation is to acquire the list mutex lock
- *	(thus preventing insertion or deletion)
+ *	(thus preventing insertation or deletion)
  *	and then call the device's poll function IFF this device is
  *	running polled and there is a poll function defined.
  */