patch 8.2.2160: various typos

Problem:    Various typos.
Solution:   Fix spelling mistakes. (closes #7494)
diff --git a/src/eval.c b/src/eval.c
index 6ce2ebf..06c6ada 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -4631,7 +4631,7 @@
  * "numbuf" is used for a number.
  * When "copyID" is not NULL replace recursive lists and dicts with "...".
  * When both "echo_style" and "composite_val" are FALSE, put quotes around
- * stings as "string()", otherwise does not put quotes around strings, as
+ * strings as "string()", otherwise does not put quotes around strings, as
  * ":echo" displays values.
  * When "restore_copyID" is FALSE, repeated items in dictionaries and lists
  * are replaced with "...".