patch 8.2.0156: various typos in source files and tests

Problem:    Various typos in source files and tests.
Solution:   Fix the typos. (Emir Sari, closes #5532)
diff --git a/src/option.h b/src/option.h
index 4ccf22a..8b04d18 100644
--- a/src/option.h
+++ b/src/option.h
@@ -1066,7 +1066,7 @@
 EXTERN long	p_wd;		// 'writedelay'
 
 /*
- * "indir" values for buffer-local opions.
+ * "indir" values for buffer-local options.
  * These need to be defined globally, so that the BV_COUNT can be used with
  * b_p_scriptID[].
  */