blkif: Fix a couple of typos

Those where fixed in OVMF's copy. (And one of them fixed in QEMU's
copy but later discarded by an update.)

Signed-off-by: Anthony PERARD <anthony.perard@vates.tech>
Reviewed-by: Frediano Ziglio <frediano.ziglio@cloud.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>

xen/include/public/io/blkif.h

@@ -42,7 +42,7 @@
  * All data in the XenStore is stored as strings.  Nodes specifying numeric
  * values are encoded in decimal.  Integer value ranges listed below are
  * expressed as fixed sized integer types capable of storing the conversion
- * of a properly formated node string, without loss of information.
+ * of a properly formatted node string, without loss of information.
  *
  * Any specified default value is in effect if the corresponding XenBus node
  * is not present in the XenStore.
@@ -328,7 +328,7 @@
  *      access (even when it should be read-only). If the frontend hits the
  *      maximum number of allowed persistently mapped grants, it can fallback
  *      to non persistent mode. This will cause a performance degradation,
- *      since the the backend driver will still try to map those grants
+ *      since the backend driver will still try to map those grants
  *      persistently. Since the persistent grants protocol is compatible with
  *      the previous protocol, a frontend driver can choose to work in
  *      persistent mode even when the backend doesn't support it.