Fix typos in comments
diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 1ffb876..81c358e 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -30,7 +30,7 @@
* Error code layout.
*
* Currently we try to keep all error codes within the negative space of 16
- * bytes signed integers to support all platforms (-0x0000 - -0x8000). In
+ * bits signed integers to support all platforms (-0x0001 - -0x7FFF). In
* addition we'd like to give two layers of information on the error if
* possible.
*
@@ -38,7 +38,7 @@
*
* 16 bit error code bit-segmentation
*
- * 1 bit - Sign bit
+ * 1 bit - Unused (sign bit)
* 3 bits - High level module ID
* 5 bits - Module-dependent error code
* 7 bits - Low level module errors