Typo, spelling and grammatical fixes

Minor fixes to documentation and code comments.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index 6efb2f0..9fdf009 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -494,10 +494,10 @@
     blkcfg.heads = s->conf->heads;
     /*
      * We must ensure that the block device capacity is a multiple of
-     * the logical block size. If that is not the case, lets use
+     * the logical block size. If that is not the case, let's use
      * sector_mask to adopt the geometry to have a correct picture.
      * For those devices where the capacity is ok for the given geometry
-     * we dont touch the sector value of the geometry, since some devices
+     * we don't touch the sector value of the geometry, since some devices
      * (like s390 dasd) need a specific value. Here the capacity is already
      * cyls*heads*secs*blk_size and the sector value is not block size
      * divided by 512 - instead it is the amount of blk_size blocks
diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c
index 566b4bf..67dbe68 100644
--- a/hw/intc/armv7m_nvic.c
+++ b/hw/intc/armv7m_nvic.c
@@ -172,7 +172,7 @@
         return 10000;
     case 0xd00: /* CPUID Base.  */
         return cpu_single_env->cp15.c0_cpuid;
-    case 0xd04: /* Interrypt Control State.  */
+    case 0xd04: /* Interrupt Control State.  */
         /* VECTACTIVE */
         val = s->gic.running_irq[0];
         if (val == 1023) {
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 76b63e2..a49e440 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -76,7 +76,7 @@
     }
     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 
-    /* lets propagate the changed ram size into the global variable. */
+    /* let's propagate the changed ram size into the global variable. */
     ram_size = my_ram_size;
 
     /* get a BUS */
diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c
index f82c0e1..46aec99 100644
--- a/hw/s390x/s390-virtio.c
+++ b/hw/s390x/s390-virtio.c
@@ -240,7 +240,7 @@
     }
     my_ram_size = my_ram_size >> (20 + shift) << (20 + shift);
 
-    /* lets propagate the changed ram size into the global variable. */
+    /* let's propagate the changed ram size into the global variable. */
     ram_size = my_ram_size;
 
     /* get a BUS */
diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 66c4014..2e0ef3e 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -308,7 +308,7 @@
         sd->csd[13] = 0x40;
         sd->csd[14] = 0x00;
         sd->csd[15] = 0x00;
-        sd->ocr |= 1 << 30;	/* High Capacity SD Memort Card */
+        sd->ocr |= 1 << 30;     /* High Capacity SD Memory Card */
     }
 }
 
@@ -1541,7 +1541,7 @@
 
     case 25:	/* CMD25:  WRITE_MULTIPLE_BLOCK */
         if (sd->data_offset == 0) {
-            /* Start of the block - lets check the address is valid */
+            /* Start of the block - let's check the address is valid */
             if (sd->data_start + sd->blk_len > sd->size) {
                 sd->card_status |= ADDRESS_ERROR;
                 break;