patch 8.1.2243: typos in comments

Problem:    Typos in comments.
Solution:   Fix the typos. (Dominique Pelle, closes #5160)  Also adjust
            formatting a bit.
diff --git a/src/vim.h b/src/vim.h
index de5873c..97c1f6c 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -325,7 +325,7 @@
 typedef unsigned int	int_u;
 
 // Older systems do not have support for long long
-// use a typedef instead of hadcoded long long
+// use a typedef instead of hard-coded long long
 #ifdef HAVE_NO_LONG_LONG
  typedef long long_long_T;
  typedef long unsigned long_long_u_T;