selfguided_neon,cosmetics: fix some typos

Change-Id: I7fc559bdc1bc76686f6b190a0b3cc77e778680c6
diff --git a/av1/common/arm/selfguided_neon.c b/av1/common/arm/selfguided_neon.c
index 5593bcb..a58beb9 100644
--- a/av1/common/arm/selfguided_neon.c
+++ b/av1/common/arm/selfguided_neon.c
@@ -1350,7 +1350,7 @@
     }
   }
 
-  // memeset for unintialized rows of src buffer as it needed for
+  // memset uninitialized rows of src buffer as they are needed for the
   // boxsum filter calculation.
   for (int x = height; x < height + 5; x++)
     memset(dst + x * dst_stride, 0, (width + 2) * sizeof(*dst));
@@ -1395,7 +1395,7 @@
     memcpy((dst_ptr + x * dst_stride), (src_ptr + x * src_stride),
            sizeof(uint16_t) * width);
   }
-  // memeset for unintialized rows of src buffer as it needed for
+  // memset uninitialized rows of src buffer as they are needed for the
   // boxsum filter calculation.
   for (int x = height; x < height + 5; x++)
     memset(dst + x * dst_stride, 0, (width + 2) * sizeof(*dst));