patch 9.0.0828: various typos

Problem:    Various typos.
Solution:   Correct typos. (closes #11432)
diff --git a/src/typval.c b/src/typval.c
index d6f6196..a445bf8 100644
--- a/src/typval.c
+++ b/src/typval.c
@@ -1407,7 +1407,7 @@
 }
 
 /*
- * Compare "tv1" to "tv2" as lists acording to "type" and "ic".
+ * Compare "tv1" to "tv2" as lists according to "type" and "ic".
  * Put the result, false or true, in "res".
  * Return FAIL and give an error message when the comparison can't be done.
  */
@@ -1489,7 +1489,7 @@
 }
 
 /*
- * Compare "tv1" to "tv2" as blobs acording to "type".
+ * Compare "tv1" to "tv2" as blobs according to "type".
  * Put the result, false or true, in "res".
  * Return FAIL and give an error message when the comparison can't be done.
  */
@@ -1529,7 +1529,7 @@
 }
 
 /*
- * Compare "tv1" to "tv2" as dictionaries acording to "type" and "ic".
+ * Compare "tv1" to "tv2" as dictionaries according to "type" and "ic".
  * Put the result, false or true, in "res".
  * Return FAIL and give an error message when the comparison can't be done.
  */
@@ -1570,7 +1570,7 @@
 }
 
 /*
- * Compare "tv1" to "tv2" as funcrefs acording to "type" and "ic".
+ * Compare "tv1" to "tv2" as funcrefs according to "type" and "ic".
  * Put the result, false or true, in "res".
  * Return FAIL and give an error message when the comparison can't be done.
  */