patch 8.2.2160: various typos

Problem:    Various typos.
Solution:   Fix spelling mistakes. (closes #7494)
diff --git a/src/cindent.c b/src/cindent.c
index aeecc4b..b2fac1a 100644
--- a/src/cindent.c
+++ b/src/cindent.c
@@ -2121,7 +2121,7 @@
     }
 
     // #defines and so on go at the left when included in 'cinkeys',
-    // exluding pragmas when customized in 'cinoptions'
+    // excluding pragmas when customized in 'cinoptions'
     if (*theline == '#' && (*linecopy == '#' || in_cinkeys('#', ' ', TRUE)))
     {
 	char_u *directive = skipwhite(theline + 1);