Spelling fixes in comments, documentation, tests and examples

By klemens <ka7@github.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

util-linux/volume_id/udf.c

@@ -137,7 +137,7 @@ anchor:
 	if (type != 2) /* TAG_ID_AVDP */
 		goto found;
 
-	/* get desriptor list address and block count */
+	/* get descriptor list address and block count */
 	count = le32_to_cpu(vd->type.anchor.length) / bs;
 	loc = le32_to_cpu(vd->type.anchor.location);
 	dbg("0x%x descriptors starting at logical secor 0x%x", count, loc);